Grégoire Canvel has everything a man could want. A wife he loves, three delightful children and a stimulating job. He's a film producer. Discovering talented filmmakers and developing films that fit his conception of the cinema-free and true to life-is precisely his reason for living. Yet his prestigious production company, Moon Films, is on its last legs. Too many productions, too many risks, too many debts. Storm clouds are gathering. But Grégoire ploughs on at all costs. Where will his blind obstinacy lead him?

A middle-aged man, an architect by trade, decides to make an end run around getting married. He marries a charming young woman, tenderly in love, who proves incapable of holding him back and, above all, of making him work. But a young American arrives in Paris and reveals that he is the architect's natural son. At first reluctant, the latter and his young wife quickly adapt to the new situation, until the son, a businessman through and through, wants to share with his father his ideas on life, which can be summed up in one sentence: hard work, with no time for pleasure. The father is quick to balk, and the son is forced to unwillingly participate in the fickle architect's nightlife. Eventually, the father is able to settle down, while the son, having acquired a taste for love, has a good time.