An unidentified fifteen year-old girl is found hanged after an anonymous tip-off. The girl, Silvia Polvesi, is soon discovered to have been murdered. A peeping tom is caught with photos of her having sex with a teenage drop-out but he is later released due to lack of evidence. The investigation, conducted by Inspector Silvestri and the assistant public prosecutor Vittoria Stori, focuses on the girl's parents. It transpires that a private detective, Ruggero Pollente, was hired by Silvia's mother because the latter was concerned about her activities. As a conspiracy begins to emerge, Pollente's body is found dismembered and his girlfriend is subsequently attacked by a machete-wielding killer clad in motorcycle gear...
as Asst. DA Vittoria Stori
as Insp. Silvestri
as Insp. Valentini
as Bruno Paglia
as Mr. Polvesi
as Mrs. Polvesi
as Marcello Tosti
as DA
as Rosa
as Sgt. Giardina
as Napoli
as Polvesi's Housemaid
as Silvia Polvesi (as Cheryl Lee Buchanan)
as Patrizia Valentini
as Reporter
as Laura
as Giuliana Bigi
as Mrs. Talenti
as Agt. Russo
as Reporter
as Cop / Reporter (uncredited)
as Paglia's Lawyer (uncredited)
as Doctor (uncredited)
as Coroner (uncredited)
as Cop (uncredited)
as Prof. Beltrame (uncredited)
as Cop (uncredited)