Police Comissioner Datti is investigating the murder of a female doctor whose murderer seems to be a thirty-fivish year old man. Soon another murder follows: Pianist Robert Dominici's girlfriend is found killed. The killer also challenges Datti on the phone and says he can't be caught since he has a secret which makes him invulnerable. In the meantime the clues seems to point in strange directions...
Michael York
Robert Dominici
Edwige Fenech
Hélène Martell
Donald Pleasence
Inspector Datti
Mapi Galán
Susanna
Fabio Sartor
Davide
Renato Cortesi
Agent Marchi
Antonella Ponziani
Gloria Datti
Carola Stagnaro
Dr. Carla Pesenti
Caterina Boratto
Robert's Mother
Giovanni Lombardo Radice
Father Giuliano
Marino Masé
Aging Expert
Loris Loddi
Danzil, a Cop
Hal Yamanouchi
Swordmaster
Achille Brugnini
Giovanni Tamberi
Andrea
Diego Verdegiglio
Raffaella Baracchi
Laura, Venice Prostitute
Daniela Merlo
Mother (uncredited)
Rossana Canghiari
Party Guest (uncredited)
Giuseppe Marrocco
Man at Robert's Piano Concert (uncredited)
Benito Stefanelli
Man in Restroom (uncredited)
