The document defines thrillers as novels or films with exciting crime or action plots that hint at something scary. It provides examples of the thrillers Lucy, Se7en, and Taken, describing Lucy as a sci-fi action thriller about a woman who gains abilities, Se7en as a mystery thriller about detectives hunting a serial killer, and Taken as an action crime thriller about a father rescuing his kidnapped daughter in Europe. The document discusses conventions of the thriller genre like suspense, mystery, stereotypical representations of distressed victims and heroic rescuers, and the use of props, sound, and genres like action to build suspense.