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...
| Editing | Antonio Siciliano | Editor |
| Art | Franco Bottari | Art Direction |
| Editing | Loredana Cruciani | Assistant Editor |
| Writing | Massimo Dallamano | Screenplay |
| Sound | Stelvio Cipriani | Original Music Composer |
| Production | Egidio Valentini | Production Supervisor |
| Writing | Ettore Sanzò | Story |
| Crew | Margherita Autuori | Unit Publicist |
| Camera | Giancarlo Giannesi | Assistant Camera |
| Crew | Enrico Lucherini | Unit Publicist |
| Production | Paolo Infascelli | Production Manager |
| Camera | Walter Civirani | Still Photographer |
| Sound | Romano Checcacci | Sound Mixer |
| Directing | Vanda Tuzzi | Continuity |
| Writing | Ettore Sanzò | Screenplay |
| Directing | Mimmola Girosi | Assistant Director |
| Directing | Massimo Dallamano | Director |
| Camera | Giovanni Ciarlo | Camera Operator |
| Crew | Matteo Spinola | Unit Publicist |
| Camera | Franco Delli Colli | Director of Photography |
