Dr. Duclos (Fernand Gravey) is blackmailed by Marquis Gastone de Chemandel (Totò) with a letter that would ruin his son Pierre (Paul Guers) In order to save him agrees to help the Marquis in an insurance scam. Totò, a poor Neapolitan vagabond, lookalike of the Marquis, is found. The plan is to take him to Paris, and then collect the insurance premium...
