The 39 Clues facts for kids

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The 39 Clues

The 39 Clues The Maze of Bones One False Note The Sword Thief Beyond the Grave The Black Circle In Too Deep The Viper's Nest The Emperor's Code Storm Warning Into the Gauntlet Vespers Rising Cahills vs. Vespers The Medusa Plot A King's Ransom The Dead of Night Shatterproof Trust No One Day of Doom Unstoppable Nowhere To Run Breakaway Countdown Flashpoint Doublecross Mission Titanic Mission Hindenberg Mission Hurricane Mission Atomic Superspecial Outbreak
Author	Rick Riordan Gordon Korman Peter Lerangis Jude Watson Patrick Carman Linda Sue Park Margaret Peterson Haddix Roland Smith David Baldacci Jeff Hirsch Natalie Standiford C. Alexander London Sarwat Chadda Jenny Goebel
Country	United States
Language	English
Genre	Adventure Young adult
Publisher	Scholastic
Published	2008—2016
Media type	Print (hardcover)

The 39 Clues is an exciting series of adventure books. Many different authors worked together to write them. Some famous authors include Rick Riordan and Gordon Korman. The series tells the story of two siblings, Amy and Dan Cahill. They find out their family, the Cahills, has been very important throughout history.

The first part of the series is about Amy and Dan searching for 39 secret clues. These clues are ingredients for a special serum. This serum can make someone the most powerful person on Earth. The books became very popular after the first one, The Maze of Bones, came out in 2008. Millions of copies have been sold and translated into many languages. Scholastic Press publishes the books in the United States. Steven Spielberg bought the rights to make movies based on the series.

The Clue Hunt: Finding the 39 Clues

The 39 Clues books and card packs.

The path Amy and Dan took in the first ten books.

This first series is all about Amy and Dan Cahill. They are orphans and learn that their family has played a huge role in world history. Amy and Dan must find the clues while other Cahill relatives try to stop them. In each book, Amy, Dan, and their au pair (a helper who lives with them) Nellie travel to a new place. They also learn about a famous historical person linked to a clue.

Book 1: The Maze of Bones

The Maze of Bones is the first book. Rick Riordan wrote it, and it came out in 2008.

Amy and Dan's grandmother, Grace Cahill, changes her will before she dies. At her funeral, her lawyer gives them a choice. They can have one million dollars or join a hunt for 39 clues. Amy and Dan choose the hunt. They compete against other experienced clue hunters. These include the Holt family, Alistair Oh, the Starling Triplets, the Kabras, Jonah Wizard, and Irina Spasky.

They find a secret library in Grace's house. The house then burns down because of the Holts. Amy, Dan, Alistair, and their cat Saladin escape. They follow a clue to the Franklin Institute in Philadelphia. The Starling Triplets get hurt by the Holts. Amy and Dan learn that Benjamin Franklin hid a clue in Paris. They convince Nellie to go with them. In Paris, they find codes and traps. These lead them to catacombs under the city. They find the location of an old church etched into skulls. At the church, they see a painting of the four Cahill ancestors. They also find the clue wrapped around a serum vial. The Kabras steal the vial. Amy hides the paper with Dan. Dan solves the puzzle. The clue is "iron solute," which is an anagram for "resolution." They also find secret sheet music. Amy's research suggests the next clue is in Vienna, home of Wolfgang Amadeus Mozart.

Book 2: One False Note

One False Note is the second book. Gordon Korman wrote it, and it was published in 2008.

On their way to Vienna, the Holts try to steal the clue. But Saladin tears it up! Luckily, Dan remembers it all. They go to Mozart's house. They sneak into the library to find Mozart's sister's diary. But Jonah Wizard has already stolen it. They steal the diary back. The diary leads them to Salzburg, Mozart's birthplace. An explosion causes a cave-in there. Amy and Dan think a mysterious man caused it. But they later find out it was Alistair Oh. They get back at him by putting a tracker on his cane.

Dan, Amy, and Nellie then go to Venice. Dan and Amy sneak into a Janus family hideout. They steal an important clue and escape. The Kabras then kidnap them. But they let them go after finding nothing. Dan and Amy had hidden the clue in a pillow on a boat. They get the clue back and sneak into a museum. Ian and Natalie Kabra attack them. They play Mozart's first harpsichord with the clue. The clue is pages from Nannerl's diary. The fifth note sets off a trap, knocking Ian out. Natalie gets hit by a dart. Dan and Amy play the music correctly. They find the second clue: tungsten. They also find Japanese swords, hinting at their next stop.

Book 3: The Sword Thief

The Sword Thief is the third book. Peter Lerangis wrote it, and it came out in 2009.

The tungsten swords lead Amy, Dan, and Nellie to Japan. They look for a clue linked to the Japanese warrior Toyotomi Hideyoshi. They team up with Alistair Oh and the Kabras. They follow clues to Korea. They stay at Alistair's house. The Kabras have a strange coin they think is a clue. A book in Alistair's secret library leads them to Pukhansan mountain. They find a cave entrance using the coin. Inside is Hideyoshi's treasure and the third clue: gold. Dan solves an anagram and tricks the Kabras. The Kabras escape and trap everyone else in the cave. Alistair seems dead, but he faked it. After escaping, Dan, Amy, and Nellie head to Egypt, as the anagram hinted.

Book 4: Beyond the Grave

Beyond the Grave is the fourth book. Jude Watson wrote it, and it was published in 2009.

Dan, Amy, and Nellie arrive at the Hotel Excelsior in Egypt. It's a stronghold built by Bae Oh, Alistair's uncle. Bae finds and traps them. Nellie finds and frees them. Jonah Wizard later traps them on a deserted island on the Nile River. Local fishermen save them and take them back to Egypt. They find the fourth clue: half a gram of myrrh. They find it through a statue Grace left them. They barely escape with help from Nellie and Saladin.

Book 5: The Black Circle

The Black Circle is the fifth book. Patrick Carman wrote it, and it came out in 2009.

Dan and Amy get a message from "NRR" and go to Russia. There, another hint from NRR leads them to a credit card and fake passports. These belonged to their dead parents. NRR says she is Nataliya Ruslanova Radova. She is the daughter of the last Romanov, a Cahill. She escaped to live quietly. A blood problem stops her from joining the clue hunt. Amy and Dan make a deal with the Holts. They find a stronghold. It reveals the next clue: Amber.

Book 6: In Too Deep

In Too Deep is the sixth book. Jude Watson wrote it, and it was published in 2009.

Dan and Amy go to Sydney, Australia. They want to learn what their parents knew about the 39 Clues. They meet their dad's cousin, Shepard Trent. They find out that Isabel Kabra, Ian and Natalie's mother, has joined the hunt. Isabel tries to feed Amy to sharks, but Hamilton Holt stops her. The siblings survive Isabel's second attack. They follow a clue to Krakatau, a volcano area. There, they meet Alistair. Isabel sets their hut on fire. Irina Spasky dies saving Amy, Dan, and Alistair. After the fire, Alistair shows them a message from Robert Cahill Henderson. It reveals the clue: water. Near the end of the book, they start to think Nellie is spying on them.

Book 7: The Viper's Nest

The Viper's Nest is the seventh book. Peter Lerangis wrote it, and it came out in 2010.

The morning after the fire, Dan and Amy realize Irina's last words were a song. This leads them to Pretoria, South Africa. They sneak into a Tomas family hideout. The Holts chase them. They think the clue is diamond, and so do the Kabras. As Dan and Amy leave South Africa, the Kabras capture them. They escape in Grace's old plane, The Flying Lemur. They have a vial of green liquid. During a fight, the vial breaks. The green liquid, a Kabra poison, spills on Dan's arm. To save Dan, they fly to Grace Cahill's home in Madagascar. They find out the clue is aloe. They also learn their parents were Madrigals. This is a group Amy and Dan have learned to fear. This means they are Madrigals too.

Book 8: The Emperor's Code

The Emperor's Code is the eighth book. Gordon Korman wrote it, and it was published in 2010.

Amy and Dan go to China to find the next clue. They argue and split up. But they meet again at Mount Everest. They find a Janus vial left by George Mallory, a British climber. They fight Eisenhower Holt and Ian Kabra over a partial serum. Ian falls. Amy uses the serum to save him. Dan thinks they lost the clue. But Amy shows him a poem on silk fabric they found in Beijing. She tells him the next clue is raw silkworm secretion. They realize a formula on the silk means four partial serums make one master serum. Dan shows Amy a locket he found at a Shaolin temple. It has the name of pirate Anne Bonnie. They decide their next stop is the Caribbean.

Book 9: Storm Warning

Storm Warning is the ninth book. Linda Sue Park wrote it, and it came out in 2010.

Amy and Dan continue their hunt in the Bahamas and Jamaica. They don't trust Nellie after learning she works for William McIntyre. First, they go to Oceanus, an amusement park in the Bahamas. Dan enjoys the rides. Amy tells Dan about a pirate tour. It takes tourists to islands famous pirates visited. Amy and Dan agree to go, with Nellie. At a cove, the first mate gives Amy and Dan a paper with a message. They decode it: "EAST END OF ISLAND. CAVE."

Meanwhile, Natalie Kabra has nightmares about her mother, Isabel, trying to hurt Dan and Amy. The Cahills find a Tomas bear claw in the cave. But Amy gets hurt when the tide comes in. The group decides to go to Jamaica. At the Montego Bay airport, they find a hotel. They follow a lead to Spanish Town. They meet a historian, Lester, and his grandma, Miss Alice. They learn Nellie's family has ties to the Cahills. They go to the Port Royal excavation site with Lester. They find a box Grace donated that fits their collected objects. They can't open the box. Isabel's thugs chase them. Lester, who has the box, leads them into quicksand. He gets stuck and drowns.

After this, the siblings quit the hunt. Instead of taking them to the airport, Nellie stops at Moore town. She gives the box to a mysterious "Man In Black." He has been following Dan and Amy. He gives the siblings one hour to open the box. They figure out a strip they found is an unfolded Möbius strip. Amy puts the strip into the box, and it opens. It holds a poem by Madeleine Cahill and the clue: mace. The mystery man is Fiske Cahill, Amy and Dan's great-uncle and Grace's younger brother. He reveals the Madrigal branch. This is a secret part of the Cahill family. He makes Amy, Dan, and Nellie active Madrigals. Nellie is the first non-blood Madrigal. After reading the poem, Dan thinks their next stop is England.

Book 10: Into The Gauntlet

Into The Gauntlet is the tenth book. Margaret Peterson Haddix wrote it, and it was published in 2010.

All the Cahills go to the Globe Theater in London. They fight over a note. Amy and Dan get most of it. Other teams get little or nothing. All the teams dig up a grave. This leads them to the Cahill island, home of the founder, Gideon Cahill. They go through a challenge with questions for each family branch. Isabel Kabra captures them. She threatens their loved ones if they don't reveal their clues. She gets them to tell their clues and makes the serum. But Amy smashes the serum over Isabel's head, knocking her out. The last clue is the serum formula. Dan memorizes it, but no one wants it anymore. Amy and Dan bring the Cahills back together. Everyone will now have different lives. They go back to their normal lives, each getting two million dollars.

Book 11: Vespers Rising

Vespers Rising is the eleventh and final book in the first series. It was published in 2011. Rick Riordan, Peter Lerangis, Gordon Korman, and Jude Watson each wrote a part.

• The first part describes Gideon Cahill finding the master serum. His friend, Damien Vesper, betrays him.
• The second part tells about Gideon's daughter, Madeleine. She tries to reunite the Cahill family. She also protects her father's ring and tries to outsmart Damien Vesper.
• The third part is about Grace's first mission. She competes against Vesper agent General George S. Patton to get Gideon's ring.
• The fourth part describes Amy and Dan getting Gideon's ring. Grace left it to Amy. They escape Casper Wyoming, a Vesper agent.

Cahills vs. Vespers: A New Enemy

Cahills vs. Vespers is the second series in The 39 Clues. It's about the now-united Cahill family fighting a new enemy: the Vespers.

Book 1: The Medusa Plot

The Medusa Plot is the first book in this series. Gordon Korman wrote it.

Two years after the Clue hunt, all who found Gideon's serum recipe have joined forces. The Cahill family feud is over. They unite to fight the Vespers. This is a secret group that has been the Cahills' enemy since Gideon's time. Vesper One leads them. Members of the Cahill family are kidnapped. They will only be returned if Dan and Amy follow Vesper One's orders.

Book 2: A King's Ransom

A King's Ransom is the second book in this series. Jude Watson wrote it, and it was published in 2011.

Amy and Dan are in Florence, Italy. They meet a girl named Vanessa Mallory. She is Cheyenne Wyoming in disguise. They use her to get on a train to Lucerne, Switzerland. Vesper One sends them there for their next mission: find the De Virga world map. Amy learns from German map records that they must search Neuschwanstein Castle. Amy and Dan find a black notebook at the castle. It belongs to Sparrow, also known as Jane Sperling. Inside is a note that leads to the de Virga map.

The Cahill Command Center analyzes the notes. They refer to a Johannes Kepler book from the castle. The Cahills go to the book's location in Prague. But they can't get in without a reference. They go to Sedlec Ossuary on a hunch. They find a Vesper One report on a flash drive. They also see the initials AJT, Arthur Josiah Trent, carved on the wall. Dan is shocked because Arthur was their father. Erasmus, a Cahill, explains that Arthur joined the Vespers but later left them. A Cahill helps Dan and Amy enter the library. They meet Jake and Atticus, who help them. The library director gives them what they want. They find the map in the book. In Rome, a Vesper dressed as a waiter kills William McIntyre. He leaves a secret message in his shoe. Back in Prague, Amy and Dan tell Atticus what they are doing. Atticus says he is a Guardian, a family allied with the Cahills. Dan connects Il Milione and the map to Samarkand, Uzbekistan. This is their next stop. Vesper One asks them to drop a package at the Astronomical Tower. They do, but the Vespers kidnap Atticus, who followed them. Vesper One knows Dan and Amy hid Marco Polo's epilogue. He says Atticus was the price for keeping it. Minutes later, AJT sends another message to Dan's phone.

Book 3: The Dead of Night

The Dead of Night is the third book in the series. Peter Lerangis wrote it, and it was published in 2012.

The Vespers have Atticus Rosenbloom. They will kill him if Dan and Amy don't do what they say. Vesper One tells Amy and Dan to find a "stale orb," which is an anagram for astrolabe. They fly to Samarkand, Uzbekistan, to find it. Atticus escapes. Dan thinks his father killed William McIntyre and is Vesper One. Ian goes to New York. He suspects Isabel is Vesper One. Isabel tricks him into staying. She says the other Cahills are not his friends. The hostages are rumored to be in Argentina. This is because of a lizard Nellie holds in a photo. Dan has gathered seventeen ingredients for his own master serum. He has also been getting texts from a Vesper claiming to be his father. He texts back a question to check. The answer is correct, which shocks him.

Book 4: Shatterproof

Shatterproof is the fourth book in the series. Roland Smith wrote it, and it came out in 2012.

Amy and Dan must steal the Golden Jubilee Diamond from Berlin's Pergamon Museum. This is to stop Vesper One from killing a Cahill. The Diamond is too well protected. But they escape security. Vesper One says they were just a distraction. He has what he needs. He tells them to find the "Apology," a Roman article. Jonah, Hamilton, and Erasmus track down Luna Amato, a Vesper. They want information about William McIntyre's murder. Luna kills Erasmus, but Jonah kills Luna. The hostages try to escape, but the Vespers stop them. Phoenix, a hostage and Jonah Wizard's cousin, falls off a cliff. Before they escape, Casper and Cheyenne tell Amy and Dan about Phoenix's death. This makes Amy blame Ian. Phoenix is later revealed to have survived and escapes.

Book 5: Trust No One

Trust No One is the fifth book in the series. Linda Sue Park wrote it, and it was published in 2012. The story features Isabel and takes place in Brazil.

Vesper One tells Amy and Dan to go to Yale and steal Folio 74 of the Voynich Manuscript. Evan finds out that Sinead is Vesper Three. She blocks Evan's messages. But Amy finds out, and they fight before Sinead runs away. Amy then says sorry to Ian. They find that the folio is missing. They meet Dave Speminer, a friend of Atticus's mother. Atticus remembers his mom saying: "Missing Voynich with LaCher." Vesper One streams a video of Nellie. He tells them Alistair is dead. They check Astrid Rosenbloom's email for clues about the folio. A coded email sends them to the Iguazu Falls in Brazil. During a capoeira show, a dancer "accidentally" hurts Atticus. At the Falls, a second attack happens. A dart with poison hits Dan. But a doctor saves him. They realize Isabel Kabra planned the attacks. There will be one more.

A taxi driver takes them to a hotel. He sees Dan's laptop wallpaper, a picture from the Voynich. At the spa, they meet LaCher Siffright, who has Folio 74. LaCher protects Atticus from the third attack. A man throws a knife and skewer at Atticus. They find the folio. They realize Archimedes is part of the Vespers' plan. They think Isabel is Vesper One. They ask Hamilton and Jonah to learn more about Archimedes. Amy is tricked into giving Vesper One Gideon's ring. Grace had given it to her. They find out the Vespers' plan: to build the Machina Fini Mundi, a doomsday device. Amy is upset by her mistake. She hides in her mind, ignoring the world. Dan decides the team should go to Attleboro. He believes he needs the serum to fight a doomsday device. He drinks a liquid made by an Ekaterina scientist.

Book 6: Day of Doom

Day of Doom is the sixth and final book in the Cahills vs. Vespers series. David Baldacci wrote it, and it was published in 2013.

Dan drinks the "serum" he made. But Amy says she replaced it with vegetables. Amy tells Dan that Isabel Kabra is Vesper Two, not Vesper One. She is flying to Washington, D.C.. Following a clue from Astrid, Amy and Dan go to the National Museum of Natural History. It has many Lewis and Clark items. On the train, Vesper One sends a video of the hostages. Atticus realizes Ted is blinking Morse code. He decodes it: Riley McGrath is Vesper One. At the museum, they learn Isabel wanted to see Lewis and Clark's compass. Dan sees numbers and letters scratched on the back of the compass. Evan and Ian get a call from Phoenix from a motel in Washington state. They go there with Hamilton and Jonah. Sandy, Casper, and Cheyenne follow them. Disguised as a waitress, Cheyenne forces them into a van. She takes them to the Rocky Mountains. Dan decides to take a train to the Cascade Mountain Range. They think the hostages and the Machina Fini Mundi are there. Atticus suspects Dave. He finds out Dave Speminer is an anagram of Damien Vesper, the Vespers' founder. Dan learns Isabel was pretending to be his father and sending texts. Isabel kidnaps Atticus. She steals the serum from Dan's bag and escapes. Amy discovers Isabel changed the coordinates on the compass. The hostages and the Machina Fini Mundi are on the Rocky Mountains.

The Vespers move the hostages from the Cascades to the Rockies. On the way, the hostages escape. They stop Sandy, Casper, and Cheyenne. They meet Amy, Dan, Atticus, and Jake. They find the Machina Fini Mundi and fight the Vespers. The Vespers shoot Evan, killing him. The device kills Natalie. Amy turns the Machina Fini Mundi into a giant electromagnet. When the Vespers come, the device takes their weapons. Sandy and Damien arrive and give out stone weapons. Isabel, who drank Dan's serum, wants revenge for her children. She tries to stop Damien from putting in the last piece. The device starts. But Isabel destroys it. Damien melts into the device, causing an explosion. This kills Damien and Isabel. Afterward, Amy, Sinead, and Dan talk about returning to their normal lives.

Unstoppable: A New Threat

Unstoppable is the third series in The 39 Clues. Jude Watson wrote the story for this series. The first book, Nowhere to Run by Jude Watson, came out in 2013.

Book 1: Nowhere to Run

Nowhere to Run is the first book in this series. Jude Watson wrote it.

J. Rutherford Pierce, a presidential candidate, attacks Amy and Dan. He steals the serum from Sammy Mourad. Sammy is a Cahill student who made the serum with Dan. Pierce wants to use the serum to take over the world. He builds a media empire to attack Amy and Dan's reputation. This makes the siblings go to a safehouse in Ireland. There, they find a book by Gideon's wife, Olivia. It has the serum's antidote. Friends and family help Amy and Dan go to Troy. They find six whiskers of an Anatolian leopard, the first antidote ingredient. Meanwhile, Pierce kidnaps Sammy. He plans to make a lot of serum and build an army. Nellie pretends to be a chemist to get hired by Pierce. She wants to rescue Sammy from Trilon Laboratories.

Book 2: Breakaway

Breakaway is the second book in the series. Jeff Hirsch wrote it. It continues the fight between the Cahills and Pierce. It also shows how relations between the Cahills are getting worse.

Book 3: Countdown

Countdown is the third book in the Unstoppable series. Natalie Standiford wrote it. The story mostly takes place in Tikal, Guatemala.

In London, J. Rutherford Pierce meets the Queen. His wife, Debi Ann, curtsies even though Pierce told her not to. Pierce later breaks one of the Queen's teacups. He has tremors from the serum. He tries to make it look good, saying the teacup was old. But the Queen is not happy. Pierce thinks the Cahills are his last obstacle to world power. He vows to kill them. In Guatemala City, the Cahills and Rosenblooms are at the airport. Paparazzi sent by Pierce publicize their every move. They hear rude comments as they escape. They get into their helicopter. Pierce's soldiers are after them, ordered to kill them and make it look like an accident. The soldiers smell like kale and chlorine. After takeoff, one of Pierce's men jumps very high because of the serum. The helicopter is going to Tikal. The kids need to find "riven crystal" there for the antidote. Dan, Atticus, and Jake are ignoring Amy. She left them behind on a dangerous mission. Amy also told Jake, her ex-boyfriend, that she never loved him. Amy decides she wants her loved ones "angry and alive than dead." She also has the serum Sammy Mourad made for her.

The group talks about the riven crystal and Tikal. The helicopter suddenly shakes. The pilot, hired by Pierce, jumps out to crash the helicopter. Amy takes the controls. She flies it unsteadily to Tikal. The helicopter falls thirty feet onto a court. Everyone survives with minor injuries. A ranger helps them and tells them about Tikal. In their hotel room, the kids ask Pony to research Debi Ann, who is a Cahill. Atticus uses Olivia Cahill's book to find the crystal's location. Meanwhile, in Delaware, Nellie Gomez, pretending to be Nadine Gormey, contacts Sammy Mourad. Sammy is held there to improve the serum for Pierce. In Massachusetts, Pony tries to get information about Debi Ann. In Tikal, Pierce's thugs ambush the group. Dan nearly dies. Amy takes the serum to save Dan. Now she only has a week to live. In Delaware, Dr. Brent Bechelheimer tries to expose Nellie. But she uses pictures of his gnome hobby to make him look unstable. Amy experiences side effects that will soon kill her. Nellie discovers Jeffrey Callendar is experimenting on Fiske Cahill. In Tikal, Hamilton, Atticus, Ian, and Jonah try to find Olivia's book and the crystal. Nellie tells Pony to warn Amy and Dan about a trap. The riven crystal is found. But Dan is kidnapped. Pony is killed by Pierce's thugs. Nellie and Sammy are captured at Trilon Laboratories.

Book 4: Flashpoint

Flashpoint is the fourth and last book in the Unstoppable series. Gordon Korman wrote it.

The book starts with Dan Cahill. Cara and Galt Pierce kidnapped him. He thinks about the terrible things that happened. Pierce is almost president. Pony was killed trying to save Dan. Amy only has a few days to live because of the serum she took to save Dan. Galt and Cara Pierce, J. Rutherford Pierce's children, question Dan. They inject him with truth serum. They ask about the antidote to the serum. Cara Pierce then leaves her family. Galt says Pierce decoded Olivia Cahill's book. It tells how to make the antidote. But Dan says Pierce only "figured out our secret recipe for potato salad." By the end, they confirm the last antidote ingredient is in Angkor, Cambodia. Angkor was a very advanced ancient society. Dan breathes chloroform to pass out. Galt wants to kill Dan, but Cara wants to keep him for more questions. Dan soon escapes with Cara's help. They plan to fly to Cambodia to stop the Cahills' plans.

Doublecross: Recreating Disasters

Doublecross is the fourth series. It began with Jude Watson's Mission Titanic (2015). Amy, Dan, and their friends try to stop the Outcast's plans to cause mass destruction.

Book 1: Mission Titanic

Mission Titanic is the first book in the Doublecross series. Jude Watson wrote it, and it came out in 2015.

Ian Kabra, at seventeen, leads the Cahills. He has presidents and generals ready to help him. Ian believes he is the perfect leader. But he has already made a big mistake. A Cahill from the past, called the Outcast, challenges Ian. The Outcast has recreated four of history's worst disasters. He dares Ian to stop him. If Ian and his friends can't figure out the Outcast's clues in time, innocent people will die. Ian's only chance is to find his old allies, Amy and Dan. But finding them will mean a huge sacrifice for Ian.

Book 2: Mission Hindenburg

Mission Hindenburg is the second book in the Doublecross series. C. Alexander London wrote it, and it was published in 2015.

The Cahills are a powerful family, but they are being tested. A bad man called The Outcast is targeting them. He is recreating four of history's worst disasters. He challenges the young Cahills to find and stop these tragedies. With one disaster behind them, Dan and Amy Cahill and their friends have only days to find out the Outcast's next move.

Their search points to a terrible air disaster: the explosion of the Hindenburg airship. But no one travels by airship anymore. What do the Outcast's messages mean? The young Cahills must split up and fly to find the answer. They must do this before their whole world crashes down.

Book 3: Mission Hurricane

Mission Hurricane is the third book in the Doublecross series. Jenny Goebel wrote it, and it came out in 2016.

Thirteen-year-old Dan Cahill and his older sister, Amy, know a disaster is about to hit the world. They know they are the only ones who can stop it. But they might already be too late. The person behind the disaster is their relative, the Outcast. He has already recreated two of history's worst disasters. He is just waiting to strike again.

The clues suggest the Outcast's next disaster is like Hurricane Katrina. But what city will he target? And how can anyone create a hurricane? Dan and Amy have no answers and little time. All they know is a huge problem is coming, and they are the only ones who can stop it.

Book 4: Mission Atomic

Mission Atomic is the fourth and final book in the Doublecross series. Sarwat Chadda wrote it, and it was published in 2016.

Thirteen-year-old Dan Cahill and his older sister, Amy, are running out of time. An exiled Cahill, the Outcast, has already recreated three of history's worst disasters. He saved the worst for last. If Dan and Amy can't find and stop the Outcast fast, he will cause a nuclear meltdown.

As Dan and Amy race around the world, they find something scary. The Outcast's disasters are just a cover. His real plan is a terrible revenge on the family that betrayed him. Soon Amy and Dan must face a hard truth. Sometimes, to save the world, you have to give up everything you love. The book begins with the group in Ian's apartment in London. They decide to split up to fight the Outcast. Dan, Sammy, and Nellie go to the Black Forest in Germany. They check one of the Outcast's old labs. Amy, Jonah, and Hamilton go to Shanghai, China. They look into an event with many Ekats. Cara and Ian go to Ukraine to check out the Chernobyl disaster.

Superspecial: The Final Book

Superspecial is the fifth and final series in The 39 Clues story. It has only one book.

Book 1: Outbreak

Outbreak is the only book in the Superspecial series. It is also the final book in The 39 Clues series. C. Alexander London wrote it, and it was published in 2016.

Main Characters

To learn more about the people in the series, see List of The 39 Clues characters.

Extra Stories and Games

Scholastic has made more books to expand The 39 Clues world.

• In 2010, Agent Handbook was published. It teaches about the techniques clue hunters use.
• The Black Book of Buried Secrets gives more information about events in the series.
• In 2011, Scholastic released seven short stories. These were part of The 39 Clues: Rapid Fire e-book series.
• "The Cahill Files" includes Operation Trinity, Spymasters, and four e-books.
• To make the series interactive, Scholastic included six cards in each book. Each card had a code. Readers could enter the code online to unlock a clue.

Collectible Cards

The 39 Clues uses collectible cards to make the reading experience bigger.

• In the first series, The Clue Hunt, each book came with six game cards. These cards had the same code. When added online, they unlocked the clue for that book.
• Card Packs were also sold. These packs had 16 random cards not found in the books.
• In the second series, each book also had six cards. But these cards were needed to unlock online missions.
• Cahills vs Vespers also had two card packs. These packs had the same 16 game cards. They unlocked online "extreme" missions.
• In the third series, Unstoppable, each book has six game cards. These cards unlock an extra game in their online missions.
• In the fourth series, Doublecross, each book has six virtual cards.

The cards are a key part of the series. Players on the website need the cards to collect all the clues. In later series, they need the cards to unlock missions. The cards in the first series often had puzzles and riddles.

More cards have been released over time, and some are only virtual. Scholastic also made a game called Doublecross. In this game, players use their physical cards to battle opponents.

How the Series Started

An editorial team at Scholastic came up with the idea for an interactive series with online games. They asked Rick Riordan to write the first book. Riordan agreed because he liked the idea. As a middle school teacher, he enjoyed making history fun for young readers. The project was kept secret for about two years.

Movie Plans

Steven Spielberg bought the movie rights to the series in 2008. Spielberg and Scholastic Media president Deborah Forte were set to produce the series. Brett Ratner was interested in directing the first movie. Screenwriter Jeff Nathanson was hired in 2008. In 2012, Shawn Levy, who directed the Night at the Museum movies, got the rights to direct. Universal took over the movie rights in 2013.

A movie, The 39 Clues: The Movie, was planned for 2014. However, it seems the project was stopped. The latest information is from 2013, and production has not started.

Images for kids

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  The 39 Clues books and card packs.

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  The path Amy and Dan took in the first ten books.

See also

In Spanish: The 39 Clues para niños