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
as Robert Dominici
Edwige Fenech
as Hélène Martell
Donald Pleasence
as Inspector Datti
Mapi Galán
as Susanna
Fabio Sartor
as Davide
Renato Cortesi
as Agent Marchi
Antonella Ponziani
as Gloria Datti
Carola Stagnaro
as Dr. Carla Pesenti
Caterina Boratto
as Mrs. Dominici
Giovanni Lombardo Radice
as Padre Giuliano
Marino Masé
as Aging Expert
Loris Loddi
as Danzil
