Roberto, a drummer in a rock band, keeps receiving weird phone calls and being followed by a mysterious man. One night he manages to catch up with his persecutor and tries to get him to talk but in the ensuing struggle he accidentally stabs him. He runs away, but he understands his troubles have just begun when the following day he receives an envelope with photos of him killing the man. Someone is killing all his friends and trying to frame him for the murders.
You can now watch Four Flies on Grey Velvet online on the following streaming providers in the United States.
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| Writing | Luigi Cozzi | Story |
| Directing | Dario Argento | Director |
| Writing | Mario Foglietti | Story |
| Writing | Dario Argento | Screenplay |
| Writing | Dario Argento | Story |
| Production | Salvatore Argento | Producer |
| Camera | Franco Di Giacomo | Director of Photography |
| Sound | Ennio Morricone | Original Music Composer |
| Costume & Make-Up | Paolo Borselli | Hairstylist |
| Costume & Make-Up | Giuliano Laurenti | Makeup Artist |
| Art | Enrico Sabbatini | Production Design |
| Editing | Françoise Bonnot | Editor |
| Crew | Carlo Rambaldi | Special Effects |
| Camera | Umberto Dessena | Grip |
| Costume & Make-Up | Giovanni Viti | Wardrobe Assistant |
| Sound | Bruno Nicolai | Conductor |
| Sound | Massimo Anzellotti | Sound Effects Editor |
| Production | Carlo Du Bois | Administration |
| Art | Giuseppe Ciccocioppo | Props |
| Art | Franco Pedacchia | Set Dresser |
| Camera | Roberto Forges Davanzati | Assistant Camera |
| Camera | Gianfranco Transunto | Assistant Camera |
| Lighting | Ennio Mancini | Electrician |
| Art | Mario Grilli | Decorator |
| Art | Giovanni Viti | Assistant Art Director |
| Editing | Bruno Bianchini | Assistant Editor |
| Directing | Patrizia Zulini | Script Supervisor |
| Production | Angelo Iacono | Production Manager |
| Camera | Fernando Monti | Grip |
| Camera | Roberto Carnevali | Still Photographer |
| Lighting | Orazio Sinacore | Electrician |
| Camera | Gastone Coppa | Key Grip |
| Costume & Make-Up | Giovanni Morosi | Assistant Makeup Artist |
| Costume & Make-Up | Massimo Lentini | Assistant Costume Designer |
| Editing | Sergio Fraticelli | Assistant Editor |
| Camera | Mauro Marchetti | Assistant Camera |
| Lighting | Anteo Pacini | Electrician |
| Crew | Dino Galiano | Special Effects |
| Production | Carlo Cucchi | Production Secretary |
| Production | Roberta Leoni | Production Secretary |
| Sound | Mario Ronchetti | Sound Engineer |
| Camera | Giuseppe Lanci | Camera Operator |
| Costume & Make-Up | Mina Manes | Tailor |
| Directing | Roberto Pariante | Assistant Director |
| Sound | Franco Bassi | Sound Mixer |
| Lighting | Valerio Garzia | Gaffer |
| Sound | Edda Dell'Orso | Musician |
| Sound | Eugenio Fiori | Boom Operator |
| Camera | Mario Boccanegra | Grip |
| Lighting | Franco Gubiotti | Electrician |
| Sound | Luciano Anzellotti | Sound Effects |
| Production | Giuseppe Mangogna | Unit Manager |
