Saint Tropez. Julie Wormser and her lover, writer and neighbour Jeff Marle, plan the murder of her wealthy husband Louis, an alcoholic impotent. She hits him, and leaves the rest of the task to Jeff. Julie finds herself alone the following day, and becomes therefore the prime suspect. Where is Louis' body? Where is Jeff? Is there any secret beyond a door?
| Camera | Jean Rabier | Director of Photography |
| Camera | Yves Agostini | Camera Operator |
| Editing | Jacques Gaillard | Editor |
| Directing | Claude Chabrol | Director |
| Production | André Génovès | Producer |
| Camera | Jean Rabier | Still Photographer |
| Sound | Pierre Jansen | Original Music Composer |
| Editing | Fima Noveck | Additional Editing |
| Art | Guy Littaye | Production Design |
| Costume & Make-Up | Louis Bonnemaison | Makeup Artist |
| Costume & Make-Up | Jean-Max Guérin | Hairstylist |
| Costume & Make-Up | Didier Lavergne | Makeup Artist |
| Production | Patrick Delauneux | Unit Manager |
| Production | Pierre Gauchet | Production Manager |
| Writing | Richard Neely | Novel |
| Writing | Claude Chabrol | Screenplay |
| Directing | Michel Dupuy | Assistant Director |
| Directing | Philippe Malherbe | Assistant Director |
| Art | Marcel Laude | Property Master |
