Terry (Guttenberg) is a young executive who starts an affair with his boss's wife Sylvia (Huppert). One night, as the two are in his apartment, Sylvia witnesses a man attacking a woman from Terry's bedroom window. She doesn't want to expose their relationship and so is reluctant about talking to the police, so Terry, wanting to help but also wanting to protect Sylvia, claims he was the one at the bedroom window. The police finding out inconsistencies in his story and the real attacker being on the loose escalates Terry's life into a nightmare as he sets to find the attacker with some help from the victim, Denise (McGovern).
This film features examples of:
- Died in Your Arms Tonight: Sylvia dies in Terry's arms after being stabbed by Carl.
- The Quiet One: Carl has only one line in the film, "You?!", when he recognizes a disguised Denise as his previous would-be victim.
- Shout-Out: There are many references to Alfred Hitchcock's works: