Police Inspector Staniland is investigating the death of a pianist. While conducting his investigation and looking through the victim's apartment, he meets Barbara, the mistress of the murder victim. Barbara confesses to the crime, but Staniland, based on his observations and experience, does not believe her. He then sets out to find the truth.
| Directing | Jacques Deray | Director |
| Writing | Michel Audiard | Screenplay |
| Costume & Make-Up | Corinne Jorry | Costume Design |
| Sound | Claude Bolling | Original Music Composer |
| Writing | Jacques Deray | Screenplay |
| Camera | Jean Penzer | Director of Photography |
| Editing | Henri Lanoë | Editor |
| Art | François de Lamothe | Production Design |
| Writing | Michel Audiard | Dialogue |
| Art | Jacques Brizzio | Set Decoration |
| Production | Norbert Saada | Producer |
| Writing | Robin Cook | Novel |
