De Luca is killed by Marchetti's chauffeur. Marchetti ordered the murder because he was to be accused by De Luca. The two have a car accident while going home to get an alibi. There is a witness, Sironi, who calls the police. But when the police arrive the car has gone and so have the two men. Inspector Santi and young judge Novelli look into the strange case. Marchetti, however, is a powerful man and Sironi and his family begin to be obsessed first by threats then by assaults.
Bekim Fehmiu
as Il dottor Giorgio Sironi
Rosanna Schiaffino
as Luisa Sironi
Aldo Giuffrè
as Il commissario Santi
Guido Leontini
as Il mafiosi
Romolo Valli
as Il ministro
Elio Zamuto
as Il giudice Belli
Luigi Pistilli
as Il commissario De Luca
Claudio Nicastro
as Il commendatore
Guido Alberti
as Il questore
Corrado Annicelli
as L'anziano professore di Sironi
Barbara Betti
as Adriana Favero
Rosario Borelli
as Il maresciallo Giulio Nardoni
