The marquis Galeazzo di Torre Alta is murdered by a mysterious killer who calls himself Diabolicus. His heirs are his three brothers and a sister, but all of them, with the exception of Monsignor Antonino di Torre Alta, are killed by Diabolicus. The police are unable to solve the case, but when Antonino gives his inheritance to Pasquale Bonocore, illegitimate son of his father and Pasquale is in prison and therefore can't be the killer, all the clues are in the hand of the police.
Genres:
Totò as Galeazzo / Carlo / Scipione / Antonio / Laudomia / Pasquale
Raimondo Vianello as Barone Lallo
Nadia Sanders as Donna Fiore
Luigi Pavese as Commissario di polizia
Mario Castellani as Ispettore Scalarini
Peppino De Martino as Notaio Cocozza
Giulio Marchetti as Detective Privato
Franco Giacobini as Dottor Santoro
Pietro De Vico as Il paziente
Mimmo Poli as Il postino
Béatrice Altariba as Diana
Made by edimario