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.
| Directing | Guillaume Radot | Director |
| Writing | Francis Vincent-Bréchignac | Writer |
| Editing | Émilienne Nelissen | Editor |
| Crew | Pierre Montazel | Cinematography |
| Sound | Maurice Thiriet | Music |
| Sound | Marceau Van Hoorebecke | Music |