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
