Totò diabolicus

Someone calling himself Diabolicus has murdered the Marquis Galeazzo di Torre Alta, and the heirs to the estate start dying one after another. Totò plays the marquis, his brothers, his sister and the illegitimate son Pasquale, while Raimondo Vianello is Barone Lallo and Mario Castellani is Ispettore Scalarini, who cannot solve it. Steno stages the killings as a parody of the giallo, and Totò is left in each frame under a different wig, nose and mustache.