Mr. Gustave Bourdillon loves hopelessly the wife of the director of the institution where he is the only teacher. Soon a widow, the pretty wife of Mr. Calumet, agrees to marry the brave professor, but believes each onstant that her husband has returned in the form of his brave little dog Medor. After incredible situations and an immeasurable pursuit, Gustave Bourdillon and widow Émilie will live a deserved happiness.

Following a broadcast on the radio, each of the listeners remembers these "little nothings" (the title is borrowed from a play by Mozart), which have often changed their lives. Each of these stories told will prove that a tiny detail in life can change an entire destiny.

As playboys cannot pay their debts anymore,their creditors suggest one of them marry a millionaire's daughter.