Cashier Maurice Legrand is married to the wretched Adele. By chance, he meets Lucienne, 'Lulu', and makes her his mistress. He thinks he has finally found love, but Lulu is a streetwalker, still in love with her pimp.

Cast: Michel Simon, Janie Marèse, Georges Flamant, Magdeleine Bérubet, Roger Gaillard, Jean Gehret