| Antonio Sabato | ... | Mario | |
| Uschi Glas | ... | Giulia (as Uschi Glass) | |
| Pier Paolo Capponi | ... | Inspector Vismara | |
| Rossella Falk | ... | Elena Marchi | |
| Marina Malfatti | ... | Kathy Adams | |
| Renato Romano | ... | The Priest | |
| Claudio Gora | ... | Raffaele Ferri | |
| Gabriella Giorgelli | ... | Inez Tamborini | |
| Aldo Barberito | ... | Lt. Palumbo | |
| Bruno Corazzari | ... | Barrett | |
| Franco Fantasia | ... | Lt. Renzi | |
| Petra Schürmann | ... | Concetta di Rosa | |
| Ivano Davoli | |||
| Linda Sini | ... | Juanda | |
| Nello Pazzafini | ... | Raoul | |
| Carla Mancini | ... | Anna's maid | |
| Enzo Andronico | ... | Hotel Porter | |
| Fulvio Mingozzi | ... | Agent | |
| Nestore Cavaricci | ... | Agent | |
| Marisa Mell | ... | Anna Sartori & Maria Sartori | |
| rest of cast listed alphabetically: | |||
| Friedrich G. Beckhaus | ... | Lt. Renzi (voice: German version) (uncredited) | |
| Andrea Bosic | ... | Palmieri (uncredited) | |
| Lella Cattaneo | ... | Woman with Hat at Art Exhibit (uncredited) | |
| Armand Cava | ... | Man (uncredited) | |
| Thomas Danneberg | ... | Mario (voice: German version) (uncredited) | |
| Carolyn De Fonseca | ... | Elena Marchi (voice: English version) (uncredited) | |
| Filippo Del Bello | ... | Parroco (uncredited) | |
| Vera Drudi | ... | Mad (uncredited) | |
| Arne Elsholtz | ... | Barrett (voice: German version) (uncredited) | |
| Tom Felleghy | ... | Dr. Harris (uncredited) | |
| Lina Franchi | ... | Prostituta (uncredited) | |
| Hans W. Hamacher | ... | Raffaele Ferri (voice: German version) (uncredited) | |
| Beate Hasenau | ... | Anna Sartori (voice: German version) (uncredited) | |
| Ursula Herwig | ... | Concetta di Rosa (voice: German version) (uncredited) | |
| Ursula Heyer | ... | Kathy Adams (voice: German version) (uncredited) | |
| Lucretia Love | ... | Woman (uncredited) | |
| Alba Maiolini | ... | Mad with the Doll (uncredited) | |
| Gerd Martienzen | ... | The Priest (voice: German version) (uncredited) | |
| Gould Maynard | ... | Anna's Son (voice: German version) (uncredited) | |
| Klaus Miedel | ... | Lt. Palumbo (voice: German version) (uncredited) | |
| Ivana Novak | ... | Nurse (uncredited) | |
| Edgar Ott | ... | Inspector Vismara (voice: German version) (uncredited) | |
| Peter Schiff | ... | Man (voice: German version) (uncredited) | |
| Klaus Sonnenschein | ... | Palmieri (voice: German version) (uncredited) | |
| Luca Sportelli | ... | Conduttore (uncredited) | |
| Enzo Tarascio | ... | Man (uncredited) | |
| Maria Tedeschi | ... | Pazza che legge (uncredited) | |
| Alfred Vohrer | ... | Edgar Wallace (voice: German version) (uncredited) (archive footage) | |
| Sandra Wolff | ... | Secretary (uncredited) | |
Directed by | |||
| Umberto Lenzi | |||
Writing credits(in alphabetical order) | ||
| Roberto Gianviti | screenplay | |
| Paul Hengge | credited on German prints | |
| Umberto Lenzi | screenplay | |
| Umberto Lenzi | story | |
| Edgar Wallace | story (uncredited in italian version) | |
| Cornell Woolrich | novel "Rendezvous in Black" (uncredited) | |
Produced by | |||
| Lamberto Palmieri | .... | producer | |
Original Music by | |||
| Riz Ortolani | |||
Cinematography by | |||
| Angelo Lotti | |||
Film Editing by | |||
| Eugenio Alabiso | |||
| Clarissa Ambach | (German version) | ||
Production Design by | |||
| Giacomo Calò Carducci | |||
Costume Design by | |||
| Giulia Mafai | |||
Makeup Department | |||
| Sergio Angeloni | .... | makeup artist | |
| Anna Graziosi | .... | hair stylist | |
Production Management | |||
| Sergio Borelli | .... | production manager | |
| Herbert Kerz | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Fulvio Barresi | .... | assistant director | |
Sound Department | |||
| Renato Marinelli | .... | sound effects | |
| Bruno Moreal | .... | sound mixer | |
| Guido Ortenzi | .... | sound engineer | |
Camera and Electrical Department | |||
| Mario Sbrenna | .... | camera operator | |
Editorial Department | |||
| Amedeo Moriani | .... | assistant editor | |
Other crew | |||
| Rosaria Cilento | .... | continuity | |
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| Black Belly of the Tarantula | The Cat o' Nine Tails | The Bird with the Crystal Plumage | Giornata nera per l'ariete | Strip Nude for Your Killer |
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| Full cast and crew | Company credits | External reviews |
| IMDb Horror section | IMDb Italy section |
Despite some unfavorable reviews (notably Adrian Smith's), this is a classic giallo that really works. The puzzle of the half moon lockets is classic Edgar Wallace and is the tenuous thread that connects the set-piece murders and keeps the story moving. Sabato and Glass race around to solve the mystery and clear Sabato's name but, as per usual, the killer is one step ahead of them. It all ends in a hand to hand fight in a swimming pool that's a cut above the usual giallo climax, and everything is nicely resolved. In 1972 plot still mattered to the giallo genre (1973's Torso would change that) and the films were a lot better for it. This one goes high on the list of gialli and was a peak for Umberto Lenzi.