This thriller follows Marion Crane after she steals $40,000 from her employer. She checks into the Bates Motel, run by Norman Bates. During her shower, Marion is murdered by an unknown assailant. Her sister Lila and boyfriend Sam investigate her disappearance, shocking audiences with the revelation that Norman Bates is secretly killing people while believing he is his mother. The film is renowned for its unexpected plot twists and effective use of suspense.