An assistant pharmacist in the South of France , Blaise works for Mrs. Pinède, a well-endowed hot-blooded woman who has developed a crush on him, and her husband ... who hasn't! One day, Blaise meets Felloux, a rich man who is convalescing in Cassis. Felloux takes a liking to Blaise and decides to offer him a perfect day in Juan-les-Pins. Gambling in the casino, Blaise wins an astronomical sum. A new life seems to open to him but not for long. Indeed he loses all, but not before he has given a beautiful necklace to a young woman.

An opera singer travelling with her company on a passenger ship encounters a mysterious young man who she falls in love with.