Gervais escapes from a German concentration camp and assumes the identity of a recently deceased fellow prisoner. Knowing that the dead man has been carrying on a romance by correspondence with Hélène, whom he has never seen, Gervais makes the acquaintance of the woman and they move in, but her sister Agnès dabbles in the black arts, which should be warning enough for Gervais to make himself scarce. Yet he sticks around, intrigued that the dead man's sister, Julia, refuses to blow the whistle on him.
| Actor | Role |
|---|---|
 François PérierGervais Larauch / Bernard Pradal | Gervais Larauch / Bernard Pradal |
 Micheline PresleHélène Vanaux | Hélène Vanaux |
 Jeanne MoreauAgnès Vanaux | Agnès Vanaux |
 Madeleine RobinsonJulia Pradal | Julia Pradal |
 Marc CassotBernard Pradal | Bernard Pradal |
 Pierre MondyAndré Vilsan | André Vilsan |
 Paul FaivreDoctor Jaume | Doctor Jaume |
 Louis ArbessierPolice Commissioner Drouin | Police Commissioner Drouin |
| SSimone AngèleEulalie, boss of the inn | Eulalie, boss of the inn |
| JJo PeignotPharmacist | Pharmacist |
 Clément HarariPharmacist's Assistant | Pharmacist's Assistant |
| PPaul BargeNot listed | Not listed |
 Charles BayardNot listed | Not listed |
 Rivers CadetNot listed | Not listed |
 Rodolphe MarcillyNot listed | Not listed |
| JJoël MonteilhetNot listed | Not listed |
| JJacques MorlainePolice inspector | Police inspector |
 Andrée TainsyBusiness card seller | Business card seller |
| JJean-Jacques ValierNot listed | Not listed |