Our thriller film "Psychosis" follows the conventions of the genre. It tells the story of a girl with a mental disorder that causes her to lose touch with reality and feel no emotion, which she uses as a weapon. The film emphasizes her condition through its title and by making it the main plot device. It includes protagonists and side characters, and dresses the main character in normal clothes to show her disease is internal rather than external. The film also uses a weapon and an attempted murder scene to build tension and create tension, typical of the thriller genre. A unique aspect is its focus on a mental illness rather than supernatural elements or "crazy murderous" people.