Malpertuis is the name of an old, rambling mansion which is in reality a labyrinth where characters from Greek mythology are imprisoned by the bedridden Cassavius. He manages to keep them, as well as his nephew and niece, prisoners even after his death, through a binding testament. As Jan, the nephew, unravels the mystery, he discovers that he cannot escape the house because Malpertuis is far more significant than he was led to believe.
| Writing | Jean Ferry | Screenplay |
| Directing | Harry Kümel | Director |
| Production | Ritta Laffargue | Producer |
| Art | Pierre Cadiou | Production Design |
| Sound | Georges Delerue | Original Music Composer |
| Editing | Richard Marden | Editor |
| Camera | Gerry Fisher | Director of Photography |
| Production | Paul Laffargue | Producer |
| Production | Pierre Levie | Producer |
| Writing | Jean Ray | Novel |
| Costume & Make-Up | Claire-Lise Leisegang | Costume Design |
| Costume & Make-Up | John O'Gorman | Makeup Artist |
| Costume & Make-Up | Claudine Thyrion | Makeup Artist |
| Costume & Make-Up | Odette Van Der Greyn | Makeup Artist |
| Production | Jean-Philippe Mérand | Production Manager |
| Sound | Paul Cayatte | Sound Editor |
| Sound | Jacques Eippers | Sound |
| Sound | Henri Morelle | Sound |
