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Antonio and Peppino live in a small town in central Italy: Peppino is the barber, Totò is maintained by the rich but avaricious wife Teresa.
Mr. Pezzella owns and operates a well-established luxury-clothing store. He does not like and does not consider it right to pay taxes and therefore uses a tax consultant to be able to evade more taxes.
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.
Lazar, an old worker, does not want to share the secret of hardening rapid, a high-quality steel. The workers have no choice but to find their own original way to harden steel that is as good as rapid...
