Police Commissioner Jules Maigret returns to the small village where he spent his childhood at the request of the Countess of Saint-Fiacre, who has received a disturbing anonymous letter.
| Writing | Michel Audiard | Dialogue |
| Directing | Jean Delannoy | Director |
| Writing | Georges Simenon | Novel |
| Costume & Make-Up | Marcel Bordenave | Makeup Artist |
| Production | Jean-Paul Guibert | Producer |
| Camera | Louis Page | Director of Photography |
| Sound | Jean Prodromidès | Original Music Composer |
| Art | René Renoux | Production Design |
| Editing | Henri Taverna | Editor |
| Writing | Jean Delannoy | Screenplay |
| Writing | Rodolphe-Maurice Arlaud | Screenplay |
| Camera | Henri Tiquet | Camera Operator |
| Camera | Marc Champion | Assistant Camera |
| Directing | Pierre Zimmer | First Assistant Director |
| Directing | Joseph Drimal | Second Assistant Director |
| Directing | Claude Vériat | Script Supervisor |
| Production | Éric Geiger | General Manager |
| Art | Jacques D'Ovidio | Assistant Decorator |
| Art | Pierre Tyberghein | Assistant Decorator |
| Art | Roger Joint | Property Master |
| Art | Louis Seuret | Property Master |
| Camera | Marcel Dolé | Still Photographer |
| Editing | Ginou Bretoneiche | Assistant Editor |
| Sound | Jacques Carrère | Sound Engineer |
| Production | Claude Hauser | Production Director |
| Writing | Michel Audiard | Writer |
