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.
| Directing | Dario Argento | Director |
| Writing | Dario Argento | Story |
| Writing | Dardano Sacchetti | Story |
| Writing | Dario Argento | Screenplay |
| Sound | Ennio Morricone | Original Music Composer |
| Production | Salvatore Argento | Producer |
| Camera | Erico Menczer | Director of Photography |
| Writing | Luigi Cozzi | Story |
| Writing | Bryan Edgar Wallace | Screenplay |
| Art | Carlo Leva | Production Design |
| Costume & Make-Up | Carlo Leva | Costume Design |
| Costume & Make-Up | Luca Sabatelli | Costume Design |
| Costume & Make-Up | Giuseppe Ferranti | Makeup Artist |
| Costume & Make-Up | Vincenzo Marchetti | Assistant Makeup Artist |
| Costume & Make-Up | Pierantonio Mecacci | Makeup Artist |
| Costume & Make-Up | Maura Turchi | Hairstylist |
| Production | Angelo Iacono | Production Manager |
| Directing | Roberto Pariante | Assistant Director |
| Art | Romeo Costantini | Assistant Set Decoration |
| Art | Franco Pedacchia | Assistant Production Design |
| Art | Lamberto Verdenelli | Property Master |
| Sound | Eugenio Fiori | Boom Operator |
| Sound | Romano Pampaloni | Sound Recordist |
| Sound | Mario Ronchetti | Sound |
| Sound | Massimo Anzellotti | Sound Effects Editor |
| Lighting | Roberto Bertozzi | Electrician |
| Camera | Roberto Brega | Camera Operator |
| Camera | Arturo de Castelterlango | First Assistant Camera |
| Lighting | Rodolfo Flibotti | Gaffer |
| Camera | Giuseppe Gabrielli | Grip |
| Camera | Maurizio La Monica | Second Assistant Camera |
| Lighting | Alberico Loreti | Best Boy Electric |
| Camera | Renato Mascagno | First Assistant Camera |
| Camera | Ettore Migalizzi | Grip |
| Camera | Giovanni Migalizzi | Grip |
| Camera | Maurizio Migalizzi | Key Grip |
| Camera | Firmino Palmieri | Still Photographer |
| Lighting | Francesco Rachini | Electrician |
| Lighting | Carlo Vinciguerra | Electrician |
| Editing | Cesarina Casini | First Assistant Editor |
| Editing | Sergio Fraticelli | Assistant Editor |
| Sound | Bruno Nicolai | Conductor |
| Production | Carlo Du Bois | Administration |
| Production | Roberta Leoni | Production Secretary |
| Art | Luciano Vittori | Title Designer |
| 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 |
