A mysterious violent man breaks into a rich couples apartment and holding his wife hostage. The threatening and dangerous situation devolve into an erotic game.
| Actor | Role |
|---|---|
 Bibi AnderssonMarianne Séverin | Marianne Séverin |
 Bruno CremerWalter | Walter |
 Frédéric de PasqualeHenri Séverin | Henri Séverin |
| KKaterina LarssonJacqueline, the maid (as Katarina Larsson) | Jacqueline, the maid (as Katarina Larsson) |
| CClaude BecaultPierre (uncredited) | Pierre (uncredited) |
| HHenry BengtssonHead Waiter (uncredited) | Head Waiter (uncredited) |
| AAnne Betzholtz-MurrayAlberte (uncredited) | Alberte (uncredited) |