The rich Cassandre, desperate for his foolish and insolent son Pierrot, is prepared to hire a very expensive tutor. Polichinelle is hired, but his bad lessons in obedience, geography, arithmetic, morals and fencing immediately turn Pierrot into a brawler, drinker, liar and thief who ends up being hanged for swindling Arlequin, the cabaret owner. When Cassandra complains to Polichinelle, he kills him with a stick. Denounced by Arlequin as Pierrot's accomplice, Polichinelle kills the gendarme who came to arrest him. He is taken away by the Devil.