 Maurice Faugel has just been released from prison when he kills his friend Gilbert Varnove. Maurice then attempts to commit a robbery. The police appear and he tries to run but the police shoot at him and he is wounded. He looses consciousness and awakes in his friend Jean s apartment. He believes that his friend Silien told the police about his plans because Silien is rumoured to be a police informant. Silien is questioned by the police about the murder of Gilbert and the robbery before the police collect Maurice from a bar where he is reading a newspaper report about his girlfriend, Therese s death. Therese has been found in her car at the bottom of a quarry. Silien is released and goes to meet his ex-girlfriend Fabienne. With Fabienne s help, Silien frames someone else for the murder and robbery, leaving Maurice in the clear. Maurice is released from prison and discovers that it was Therese who told the police about the robbery and Silien and Jean who killed her. Maurice reveals that he killed Gilbert because Gilbert killed his girlfriend Arlette four years ago to keep her quiet. Silien returns home but once Silien has left, Maurice remembers that he hired a man to kill Silien because he thought he had betrayed him and chases after him.