Russian spy boss in Geneva spends a night interrogating two spies to see who is a traitor.
| Directing | Robert Hossein | Director |
| Writing | Frédéric Dard | Novel |
| Production | Philippe Dussart | Producer |
| Production | Yves Peyrot | Producer |
| Writing | Robert Hossein | Screenplay |
| Sound | Jean-Claude Petit | Music |
| Sound | Claude-Michel Schönberg | Music |
| Camera | Edmond Richard | Director of Photography |
| Editing | Sophie Bhaud | Editor |
| Art | Jacques D'Ovidio | Production Design |
| Costume & Make-Up | Sylvie Poulet | Costume Design |
| Costume & Make-Up | Josée De Luca | Makeup Artist |
| Sound | Jean Labussière | Sound |
| Sound | Claude Ermelin | Sound Mixer |
| Art | Angelo Rizzi | Set Decoration |