In Prague, a musician is consumed by jealousy for his beautiful girlfriend. He hires a private eye to spy on her, but the plan backfires...

Police Comissioner Datti is investigating the murder of a female doctor whose murderer seems to be a thirty-fivish year old man. Soon another murder follows: Pianist Robert Dominici's girlfriend is found killed. The killer also challenges Datti on the phone and says he can't be caught since he has a secret which makes him invulnerable. In the meantime the clues seems to point in strange directions...

Mr. Rorret is the owner of a cinema called "The Peeping Tom" which shows a constant stream of horror films. Rorret dates women from the audience and then kills them, taking sadistic pleasure from their expressions of terror. This film is apparently a well-filmed homage to "Peeping Tom", with nods to "Psycho" and "Strangers on a Train".

A serial killer is terrifying the prostitutes in a big Italian city. After few barbaric murdering four prostitutes Lena, Angela, Nadine and Stella decide to unify and try to self-defend themselves. The police and all the other prostitutes agree with the four and the hunting is open. Who is the cruel killer?