The Paris police are desperate to bust drug kingpin Roger Massina (Maurice Ronet). To do it, they want pimp Dede Laffont (Philippe Léotard) to serve as their inside man. Dede refuses: Informants never live very long. But Detective Palouzi (Richard Berry) isn't taking no for an answer. Sure enough, the police put pressure on Nicole Danet (Nathalie Baye), the prostitute who's also Dede's girlfriend, forcing him to make a decision that could rob him of everything.