The film begins with two dead bodies. Inspector De Paul(Blynn) is on the case. His sidekick Maestrin is asking questions. The police think that it could be drug related. De Paul pays a visit to a woman called Marzia. She tells him about the couple that were killed. She tells him that the husband Fabio has unusual sexual demands and his wife Flavia wasn't into it like he was. We get a picture of what their sex life was like. Marzia meets a man and she tells him about the police. His name is Marco. Maestrin is following her. Marco tells Marzia to get rid of photographs that she has. Another man is watching her too. Marco tells Marzia to leave Venice. Marco is a criminal. A prostitute is murdered by the same killer. De Paul brings in Marzia and Marco for questioning.