When his young son is killed in a hit and run accident, Charles Thenier resolves to hunt down and murder the killer. By chance, Thenier makes the acquaintance of an actress, Helène Lanson, who was in the car at the time of the accident. He then meets Helène’s brother-in-law, Paul Decourt, a truly horrible individual.
| Directing | Claude Chabrol | Director |
| Writing | Claude Chabrol | Screenplay |
| Writing | Paul Gégauff | Screenplay |
| Production | André Génovès | Producer |
| Sound | Pierre Jansen | Original Music Composer |
| Camera | Jean Rabier | Director of Photography |
| Editing | Jacques Gaillard | Editor |
| Art | Guy Littaye | Production Design |
| Writing | Nicholas Blake | Novel |
| Costume & Make-Up | Louis Bonnemaison | Makeup Artist |
| Production | Alain Belmondo | Unit Manager |
| Production | Georges Casati | Production Manager |
| Production | Patrick Delauneux | Unit Manager |
| Directing | Michel Dupuy | Assistant Director |
| Directing | Jacques Fansten | Assistant Director |
| Sound | Guy Chichignoud | Sound Engineer |
| Sound | Louis Devaivre | Foley |
| Sound | Monique Fardoulis | Sound Editor |
| Sound | Alex Pront | Sound Mixer |
| Camera | Paul Bonis | First Assistant Camera |
| Camera | Roger Robert | Grip |
| Camera | Claude Zidi | Camera Operator |
| Editing | Catherine Bernard | Assistant Editor |
| Sound | Dominique Zardi | Music |
