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.
Orson Welles
as Cassavius
Susan Hampshire
as Nancy / Euryale / Alice / Nurse / Charlotte
Michel Bouquet
as Charles Dideloo
Mathieu Carrière
as Jan
Jean-Pierre Cassel
as Lampernisse
Daniel Pilon
as Mathias Crook
Walter Rilla
as Eisengott
Dora van der Groen
as Sylvie Dideloo
Charles Janssens
as Philarette
Sylvie Vartan
as Bets
Jet Naessens
as Eleonora
Cara Van Wersch
as Rosalie
