Madame Clapain dies in dubious circumstances at the home of the Cadifon ladies, of which she was a tenant. A friendly inspector and Thérèse Cadifon each carry out their own investigation.
| Directing | André Berthomieu | Director |
| Writing | Édouard Estaunié | Novel |
| Writing | Françoise Giroud | Screenplay |
| Writing | Marc-Gilbert Sauvajon | Screenplay |
| Sound | Marceau Van Hoorebecke | Music |
| Sound | Maurice Thiriet | Music |
| Camera | Jean Bachelet | Director of Photography |
| Editing | Andrée Danis | Editor |
| Camera | Christian Matras | Director of Photography |
| Art | Serge Piménoff | Production Design |
| Sound | René Louge | Sound |