Having fortuitously discovered a photograph in which Marthe embraces someone unknown, Étienne Dorsay becomes jealous and imagines various stratagems to identify the lover. In the meantime, he and his friends acquire a weekend house for a very low price.
| Directing | Yves Robert | Director |
| Writing | Jean-Loup Dabadie | Writer |
| Writing | Yves Robert | Writer |
| Production | Alain Poiré | Producer |
| Sound | Vladimir Cosma | Music |
| Editing | Pierre Gillette | Editor |
| Art | Jean-Pierre Kohut-Svelko | Production Design |
| Camera | René Mathelin | Director of Photography |
| Production | Yves Robert | Producer |
| Costume & Make-Up | Nadine Dessalles | Costume Design |
| Costume & Make-Up | Irène Servet | Makeup Artist |
| Sound | Harald Maury | Sound |
