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Martin (Jean Gabin) is a venerable gardener who passes counterfeit currency to make ends meet in this situation comedy. When a tax bill puts him further in debt, his nephew convinces him to pass bigger bills to pay off the taxes and live the good life. Soon the nephew and his girlfriend buy a villa on the Riviera and some fancy cars. Martin wants out of the deal but agrees to pull off one more caper before retiring. He meets a wealthy man who takes a liking to him and helps the man win a fortune while gambling at the casino. He brings the money to his nephew who does not realize the currency is real, and when police show up looking for an escaped lion, the nephew and his girl burn what they believe are the bogus bills to avoid being arrested.