Three couples are involved in a murder at Montecarlo.
| Directing | Mario Camerini | Director |
| Writing | Rodolfo Sonego | Story |
| Writing | Luciano Vincenzoni | Screenplay |
| Production | Dino De Laurentiis | Producer |
| Writing | Rodolfo Sonego | Screenplay |
| Writing | Giorgio Arlorio | Screenplay |
| Writing | Stefano Strucchi | Screenplay |
| Camera | Gianni Di Venanzo | Director of Photography |
| Costume & Make-Up | Piero Gherardi | Costume Design |
| Art | Piero Gherardi | Production Design |
| Sound | Pino Calvi | Original Music Composer |
| Sound | Pino Calvi | Conductor |
| Editing | Giuliana Attenni | Editor |
| Sound | Bruno Brunacci | Sound |
| Sound | Bruno Moreal | Sound |
| Camera | Pasqualino De Santis | Camera Operator |
| Art | Vito Anzalone | Set Decoration |
| Directing | Mario Maffei | First Assistant Director |
| Directing | Rinaldo Ricci | First Assistant Director |
| Costume & Make-Up | Lucia Mirisola | Assistant Costume Designer |
| Costume & Make-Up | Renata Magnanti | Hairstylist |
| Directing | Marcello De Stefano | Second Assistant Director |
| Costume & Make-Up | Giuliano Laurenti | Makeup Artist |
| Production | Giorgio Morra | Unit Manager |
| Production | Gaetano Marzacchi | Unit Manager |
| Production | Franco Di Mauro | Production Secretary |
| Directing | Carla Fierro | Script Supervisor |
| Production | Fausto Saraceni | Line Producer |