Police detective Paolo Germi and the mysterious Marisa meet each other at a dance hall. Germi is unsuspecting of the secret Marisa is carrying with her: adverse conditions forced her into prostitution. As Germi finds the young girl brutally murdered, he decides to go after her killers. During his investigation, he enters a world of intrigue and obfuscation that leave an endless trail of blood.
| Actor | Role |
|---|---|
 Claudio CassinelliPaolo Germi | Paolo Germi |
 Patrizia CastaldiMarisa | Marisa |
 Mel FerrerPolice superintendent | Police superintendent |
 Massimo GirottiGaudenzio Pesce | Gaudenzio Pesce |
 Lia TanziCarmella | Carmella |
 Gianfranco BarraTeti | Teti |
 Adolfo CarusoGiannino | Giannino |
 Jenny TamburiGloria | Gloria |
 Carlo AlighieroChief S.M.C.D. office | Chief S.M.C.D. office |
| FFranco AlpestreIl Menga | Il Menga |
 Fiammetta BarallaLandlady | Landlady |
 Barbara MagnolfiFloriana | Floriana |
 Vezio NatiliPesce's Friend (uncredited) | Pesce's Friend (uncredited) |
 Aldo MassassoNot listed | Not listed |
 Roberto PosseNot listed | Not listed |
| CCarlotta WittigNot listed | Not listed |