La Balance

Nicole is a prostitution in Paris. Her former racketeer boyfriend and pimp, Dédé, has been excluded from the business of a local mob boss, Roger Massina, because of a romantic dispute over Nicole. When a police informant is killed, the police decide to recruit Dédé as a replacement. The police raid Dédé's apartment, find a gun, and blackmail him into becoming an informant using this and other threats.