A maniac on the loose is committing savage acts of slaughter, and one survivor may be the only key to unmasking the serial slayer known as the Half-Moon Killer. The mysterious half-moon lockets he leaves with his victims could be the only key to unraveling his sinister motives, but will that be enough before he completes his ice-cold plot to claim his intended seven victims?
You can now watch Seven Blood-Stained Orchids online on the following streaming providers in the United States.
| Production | Renato Romano | Producer |
| Sound | Guido Ortenzi | Sound Engineer |
| Costume & Make-Up | Sergio Angeloni | Makeup Artist |
| Directing | Fulvio Barresi | Assistant Director |
| Directing | Rosaria Cilento | Continuity |
| Camera | Mario Sbrenna | Camera Operator |
| Editing | Amedeo Moriani | Assistant Editor |
| Sound | Bruno Moreal | Sound Mixer |
| Sound | Riz Ortolani | Original Music Composer |
| Production | Sergio Borelli | Production Manager |
| Sound | Renato Marinelli | Sound Effects |
| Production | Giacomo Caló Carducci | Production Designer |
| Costume & Make-Up | Giulia Mafai | Costume Designer |
| Art | Asmi Nardó | Other |
| Sound | Riz Ortolani | Conductor |
| Directing | Umberto Lenzi | Director |
| Camera | Angelo Lotti | Director of Photography |
| Editing | Eugenio Alabiso | Editor |
| Costume & Make-Up | Anna Graziosi | Hairstylist |
| Art | E. Pandolfini | Other |
| Writing | Cornell Woolrich | Novel |
| Costume & Make-Up | Silvio Laurenzi | Costume Assistant |
| Writing | Umberto Lenzi | Screenplay |
| Art | Paolo D'Orazio | Other |
| Writing | Roberto Gianviti | Screenplay |
| Writing | Umberto Lenzi | Story |
| Production | Herbert Kerz | Production Manager |
| Production | Lamberto Palmieri | Producer |
| Production | Lamberto Palmieri | Production Coordinator |
| Writing | Edgar Wallace | Story |
