Oliviero is a drunk, burned-out writer who amuses himself by hosting orgies at his grand country manor and humiliating his wife Irina. When a number of women are murdered in grisly fashion, Oliviero becomes a prime suspect.
You can now watch Your Vice Is a Locked Room and Only I Have the Key online on the following streaming providers in the United States.
| Directing | Sergio Martino | Director |
| Writing | Adriano Bolzoni | Screenplay |
| Writing | Ernesto Gastaldi | Screenplay |
| Production | Luciano Martino | Producer |
| Sound | Bruno Nicolai | Original Music Composer |
| Camera | Giancarlo Ferrando | Director of Photography |
| Editing | Attilio Vincioni | Editor |
| Art | Giorgio Bertolini | Production Design |
| Costume & Make-Up | Oscar Capponi | Costume Design |
| Directing | Vittorio Caronia | Assistant Director |
| Production | Lamberto Palmieri | Production Manager |
| Production | Furio Rocchi | Production Manager |
| Writing | Luciano Martino | Story |
| Writing | Sauro Scavolini | Story |
| Writing | Sauro Scavolini | Screenplay |
| Costume & Make-Up | Giulio Natalucci | Makeup Artist |
| Sound | Roberto Moreal | Sound Designer |
| Writing | Edgar Allan Poe | Short Story |
