Murder mystery involving a man and his relationship with twin sisters.
| Actor | Role |
|---|---|
 Jean-Claude BrialyPaul Kastner | Paul Kastner |
 Stéphane AudranMarie Kastner / Anne | Marie Kastner / Anne |
 Robert HosseinJean Carouse | Jean Carouse |
 Michel SerraultLe commissaire Plouvier / Superintendant | Le commissaire Plouvier / Superintendant |
 Catherine SpaakFrançoise | Françoise |
 Claude ChabrolRailway guard | Railway guard |
 Madeleine DamienUne vieille dcommere | Une vieille dcommere |
| IIsabelle Del RioNot listed | Not listed |
| PPhilippe LejourNot listed | Not listed |
 Paul BiscigliaL'employe de Kastner | L'employe de Kastner |
 Michel CretonNot listed | Not listed |
 Jeanne PérezNot listed | Not listed |
| AAntonia LotitoNot listed | Not listed |
 Marius LaureyNot listed | Not listed |
 Olivier HussenotNot listed | Not listed |