A legend about the Malveneur family tells of how their ancestor sold his soul to the devil and was cursed: man by day, wolf by night. The last of the Malveneurs is a scientist who carries out strange experiments on... nobody knows exactly what the does in the underground. The wife has a heart condition, her sister-in-law is a authoritarian lady. And nights in the old castle are not exactly peaceful.
| Actor | Role |
|---|---|
 Pierre RenoirRéginald de Malveneur | Réginald de Malveneur |
 Madeleine SologneMonique Valory | Monique Valory |
 Gabrielle DorziatMagda de Malveneur | Magda de Malveneur |
 Louis Saloule docteur Andrieu | le docteur Andrieu |
 Michel MarsayPhilippe | Philippe |
| MMarie OlinskaNot listed | Not listed |
 Marcelle GéniatNot listed | Not listed |
 Yves FuretNot listed | Not listed |
 Jo DervoNot listed | Not listed |
 Henri CharrettNot listed | Not listed |
| BBijouNot listed | Not listed |
| YYolanda FaxNot listed | Not listed |
| EEliane GardaireNot listed | Not listed |