When socialite and heiress Julie Wardh begins receiving blackmail letters attributed to a mysterious serial killer, she suspects her cruel and sadistic former lover Jean is behind them. With her husband Neil frequently out of town, she falls into the arms of her friend's cousin George, and as the unknown assassin begins to make his move, she fears that one of the three men in her life may be the killer.
You can now watch The Strange Vice of Mrs Wardh online on the following streaming providers in the United States.
| Directing | Sergio Martino | Director |
| Writing | Vittorio Caronia | Screenplay |
| Writing | Ernesto Gastaldi | Screenplay |
| Writing | Eduardo Manzanos | Screenplay |
| Production | Antonio Crescenzi | Producer |
| Production | Luciano Martino | Producer |
| Sound | Nora Orlandi | Original Music Composer |
| Editing | Eugenio Alabiso | Editor |
| Camera | Florian Trenker | Director of Photography |
| Camera | Emilio Foriscot | Director of Photography |
| Writing | Eduardo Manzanos | Original Story |
| Costume & Make-Up | Riccardo Domenici | Costume Design |
| Costume & Make-Up | Mario Di Salvio | Makeup Artist |
| Production | Franco Fogagnolo | Production Supervisor |
| Production | Florian Trenker | Production Manager |
| Directing | Vittorio Caronia | Assistant Director |
| Directing | Francisco Rodríguez | Assistant Director |
| Camera | Giancarlo Ferrando | Camera Operator |
| Camera | Michele Picciaredda | Assistant Camera |
| Editing | Amedeo Moriani | Assistant Editor |
| Sound | Paolo Ormi | Music Director |
| Directing | Mirella Malatesta | Script Supervisor |
| Camera | Francesco Narducci | Still Photographer |
| Production | Lamberto Palmieri | Unit Manager |
| Production | Franco Fogagnolo | Unit Manager |
| Art | Jaime Pérez Cubero | Set Designer |
| Art | José Luis Galicia | Set Designer |
| Sound | Pietro Ortolani | Sound Recordist |
