A thriller is a genre found in literature, movies and television. It uses suspense, where the audience is made to wonder what is going to happen next. Thrillers often have a horror or crime theme. Some examples of thriller movies are Vertigo, Rear Window and The Birds.
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A common occurrence in thrillers is characters being taken as hostages who are to be ransomed. (Hostages, 1896 painting by Jean-Paul Laurens, Musée des Beaux-Arts, Lyon)
Thriller (genre) Facts for Kids. Kiddle Encyclopedia.