"An American writer living in Rome witnesses an attempted murder that is connected to an ongoing killing spree in the city and conducts his own investigation, despite he and his girlfriend being targeted by the killer."
Tony Musante
as Sam Dalmas
Suzy Kendall
as Julia
Enrico Maria Salerno
as Inspector Morosini
Eva Renzi
as Monica Ranieri
Umberto Raho
as Alberto Ranieri
Renato Romano
as Professor Carlo Dover
Giuseppe Castellano
as Monti
Mario Adorf
as Berto Consalvi
Pino Patti
as Faiena
Gildo Di Marco
as Garullo
Rosita Torosh
as Victim
Omar Bonaro
as Police Detective
Fulvio Mingozzi
Werner Peters
as Antique Dealer
Karen Valenti
as Tina
Carla Mancini
as Girl Watching TV
Bruno Erba
Annamaria Spogli
as Sandra Roversi (uncredited)
Giovanni Di Benedetto
as Professor Rinaldi (uncredited)
Reggie Nalder
as Needles (uncredited)
Maria Tedeschi
as Old Lady in Fog (uncredited)
Aldo Barozzi
as Passerby who calls the Police (uncredited)
Ugo Mari
as Mario Zandri (uncredited)
Romano Targa
as Policeman (uncredited)
Dario Argento
Director
Carlo Diotallevi
Sound
Vittorio Storaro
Director of Photography
Ennio Morricone
Original Music Composer
Story
Screenplay
Artur Brauner
Producer
Roberto Pariante
First Assistant Director
Umberto Sambuco
Unit Manager
Enrico Umetelli
Camera Operator
Arturo Zavattini
Cesarina Casini
Assistant Editor
Sergio Fraticelli
Lida Chitarrini
Script Supervisor
Eugenio Fiori
Boom Operator
Angelo Tavazza
Administration
Bruno Nicolai
Conductor
Luciano Anzellotti
Foley Artist
Fredric Brown
Novel
Salvatore Argento
Franco Fraticelli
Editor
Dario Micheli
Production Design
Costume Design
Giuseppe Ferranti
Makeup Artist
Lidia Puglia
Hairstylist
Camillo Teti
Production Manager
Alberto Bartolomei
Sound Mixer
Mauro Marchetti
Assistant Camera