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 himself and his girlfriend being targeted by the killer.
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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 as Police Detective
Werner Peters as Antique Dealer
Karen Valenti as Tina
Carla Mancini as Girl Watching TV
Bruno Erba as Police Detective
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)