Back in Paris, Bob Montagne is synonymous with gambling -- and winning. He is classy, kind and well-liked by virtually everyone in town, including police inspector Ledru. When Bob's fortune turns sour, then he gets the desperate bet of his entire life : to commemorate the Deauville casino throughout Grand Prix weekend, even when the vaults are still all full and starts to lose friends. Regrettably, Bob learns that the game is rigged and the cops are on to him.