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
Edwige Fenech
Donald Pleasence
Mapi Galán
Fabio Sartor
Renato Cortesi
Antonella Ponziani
Carola Stagnaro
Daniele Brado
Caterina Boratto
Lewis E. Ciannelli
Renata Dal Pozzo
Giovanni Lombardo Radice
Gianni Franco
Marino Masé
Achille Brugnini
Giovanni Tamberi
Loris Loddi
Hal Yamanouchi
Diego Verdegiglio
Raffaella Baracchi
Emy Valentino
Daniela Merlo
Raf Baldassarre
Rossana Canghiari
Lella Cattaneo
Ruggero Deodato
Giuseppe Marrocco
Benito Stefanelli