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...
as Robert Dominici
as Hélène Martell
as Inspector Datti
as Susanna
as Davide
as Agent Marchi
as Gloria Datti
as Dr. Carla Pesenti
as Dr. Vanni
as Robert's Mother
as Chief Physician
as Agent Corsi
as Father Giuliano
as Inspector
as Aging Expert
as Andrea
as Danzil, a Cop
as Swordmaster
as Laura, Venice Prostitute
as Mother (uncredited)
as Man in Police Line-Up (uncredited)
as Party Guest (uncredited)
as Woman at Robert's Piano Concert (uncredited)
as Man That Gets on Moped at Station (uncredited)
as Man at Robert's Piano Concert (uncredited)
as Man in Restroom (uncredited)
