On the Côte d'Azur, a rich man wins a large sum of money playing at the casino. As he leaves the establishment, he is assaulted and knocked unconscious, his loot stolen. A few days later, the young croupier who had given him his winnings is involved in a motorcycle accident while avoiding a car. The investigation brings the two men together, but the millionaire's wife falls in love with the handsome young croupier. The plot begins...