Gaby, the singer of the "Raymond's Jazz" band, leads Maurice, one of the musicians, to believe that, following a night he spent with her in the hay, he is the father of her child. In fact, the baby is neither his nor hers. He is the son of Madeleine, a young war widow who has entrusted him to her friend Gaby until she is allotted a flat. One day, Maurice happens to meet Madeleine and falls in love with her but he does not dare to confess his "paternity" to her. Fortunately the misunderstanding i...