A young businessman, out jogging one night, sees a beautiful woman undressing in her bedroom window. He is compelled to return every night to watch her, until one night he witnesses a murder in the same apartment and soon becomes the prime suspect.

Stuck in a sexless marriage, a frustrated well-to-do couple agrees to see a female sex therapist. Unfortunately, she only helps escalate the tensions between them. Meanwhile, the police are baffled by a string of brutal nightly killings.