A reporter and a blind, retired journalist try to solve a series of murders. The crimes are connected to experiments by a pharmaceutical company in secret research. The two end up becoming targets of the killer.
You can now watch The Cat o' Nine Tails online on the following streaming providers in the United States.
| Writing | Dario Argento | Story |
| Directing | Dario Argento | Director |
| Writing | Dario Argento | Screenplay |
| Writing | Dardano Sacchetti | Story |
| Production | Salvatore Argento | Producer |
| Camera | Erico Menczer | Director of Photography |
| Sound | Ennio Morricone | Original Music Composer |
| Lighting | Roberto Bertozzi | Electrician |
| Costume & Make-Up | Maura Turchi | Hairstylist |
| Sound | Massimo Anzellotti | Sound Effects Editor |
| Production | Angelo Iacono | Production Manager |
| Costume & Make-Up | Carlo Leva | Costume Design |
| Camera | Maurizio La Monica | Second Assistant Camera |
| Writing | Luigi Cozzi | Story |
| Costume & Make-Up | Vincenzo Marchetti | Assistant Makeup Artist |
| Art | Romeo Costantini | Assistant Set Decoration |
| Art | Franco Pedacchia | Assistant Production Design |
| Sound | Romano Pampaloni | Sound Recordist |
| Art | Carlo Leva | Production Design |
| Lighting | Rodolfo Flibotti | Gaffer |
| Camera | Giuseppe Gabrielli | Grip |
| Costume & Make-Up | Luca Sabatelli | Costume Design |
| Costume & Make-Up | Pierantonio Mecacci | Makeup Artist |
| Writing | Bryan Edgar Wallace | Screenplay |
| Camera | Roberto Brega | Camera Operator |
| Camera | Arturo de Castelterlango | First Assistant Camera |
| Art | Lamberto Verdenelli | Property Master |
| Directing | Roberto Pariante | Assistant Director |
| Sound | Eugenio Fiori | Boom Operator |
| Costume & Make-Up | Giuseppe Ferranti | Makeup Artist |
| Sound | Mario Ronchetti | Sound |
| Camera | Firmino Palmieri | Still Photographer |
| Camera | Renato Mascagno | First Assistant Camera |
| Camera | Ettore Migalizzi | Grip |
| Sound | Bruno Nicolai | Conductor |
| Production | Roberta Leoni | Production Secretary |
| Camera | Maurizio Migalizzi | Key Grip |
| Editing | Cesarina Casini | First Assistant Editor |
| Art | Luciano Vittori | Title Designer |
| Editing | Sergio Fraticelli | Assistant Editor |
| Camera | Giovanni Migalizzi | Grip |
| Production | Carlo Du Bois | Administration |
| Lighting | Alberico Loreti | Best Boy Electric |
| Lighting | Francesco Rachini | Electrician |
| Lighting | Carlo Vinciguerra | Electrician |
| Sound | Luciano Anzellotti | Sound Effects |
| Editing | Franco Fraticelli | Editor |
| Production | Giuseppe Mangogna | Production Manager |
| Visual Effects | Luciano Vittori | Visual Effects |
| Production | Carlo Du Bois | Production Accountant |
