In a moment of madness a middle-aged, married and respectable pharmacist kills a young woman who is sun-bathing by a lake. Unable to take in what he has done, he flees from the scene of the crime and behaves as if nothing has happened. Eventually her boyfriend is charged with the crime and, in a strange twist of fate, the killer finds himself serving on the jury.
| Writing | Jacques Robert | Writer |
| Directing | Georges Lautner | Director |
| Writing | Francis Didelot | Novel |
| Sound | Jean Yatove | Original Music Composer |
| Editing | Michelle David | Editor |
| Production | Lucien Viard | Producer |
| Camera | Maurice Fellous | Director of Photography |
| Directing | Bertrand Blier | Assistant Director |
| Directing | Claude Vital | Assistant Director |
| Directing | Renaud de Dancourt | Assistant Director |
| Writing | Jacques Robert | Adaptation |
| Writing | Pierre Laroche | Dialogue |
| Camera | Georges Pastier | Camera Operator |
| Camera | Yves Rodallec | Assistant Camera |
| Camera | Arlette Massay | Assistant Camera |
| Editing | Gina Pignier | Assistant Editor |
| Sound | Antonio Vivaldi | Music |
| Art | Robert Bouladoux | Head Decorator |
| Sound | Antoine Archimbaud | Sound Engineer |
| Sound | Raphaël Delouvrier | Assistant Sound Engineer |
| Costume & Make-Up | Reine Thomas | Makeup Department Head |
| Costume & Make-Up | Elise Servet-Larocque | Dresser |
| Camera | Robert Joffres | Still Photographer |
| Crew | Françoise Hellman | Script |
| Art | Fernand Chauviret | Props |
| Art | Pierre Barbet | Props |
| Production | Marcel Bligny | Administration |
| Production | Yvonne Eblagon | Production Secretary |
| Production | Bernard Lapeyre | Production Assistant |
| Production | Paul Joly | Production Manager |
