Having recently moved into her new apartment, Irène Cazenave, the widow of a well-known police officer, is forced by one of her husband's colleagues to take part in an investigation. The building's provocative concierge has been found murdered. We watch a parade of suspects, only to learn at the end that Irène killed the janitor under blackmail. She kills herself.
| Production | Christian Stengel | Producer |
| Directing | Christian Stengel | Director |
| Writing | Claude Accursi | Dialogue |
| Writing | Jean Ferry | Dialogue |
| Writing | Claude Accursi | Screenplay |
| Writing | René Wheeler | Dialogue |
| Writing | Jean Ferry | Screenplay |
| Crew | Simone Chevaudra | Script |
| Directing | Jean-Pierre Decourt | Script Coordinator |
| Editing | Ginette Ducoureau | Assistant Editor |
| Camera | Raymond Heil | Still Photographer |
| Camera | Georges Leclerc | Camera Operator |
| Camera | René Mathelin | Second Assistant Camera |
| Lighting | André Moindrot | Gaffer |
| Camera | Jean-Louis Picavet | First Assistant Camera |
| Production | Raymond Artus | General Manager |
| Production | Simone Besson | Production Secretary |
| Production | Simone Besson | Administration |
| Sound | Louis Hochet | Sound |
| Art | Pierre Lefait | Set Dresser |
| Directing | Jean-Pierre Decourt | Assistant Director |
| Directing | Henri Toulout | Assistant Director |
| Production | Jean Jeannin | Production Manager |
| Production | Roger Boulais | Unit Production Manager |
| Costume & Make-Up | Louis Bonnemaison | Key Makeup Artist |
| Costume & Make-Up | Hugo Swoboda | Makeup Artist |
| Art | Robert Hubert | Production Design |
| Editing | Claude Nicole | Editor |
| Crew | René Gaveau | Cinematography |
| Sound | Georges van Parys | Original Music Composer |
| Production | Georges Bernier | Producer |