Marc, a motorcycle brigadier, is engaged to the charming Véronique. But his future brother-in-law, the clumsy Roger, leader of a Sunday motorcycle gang, has set his sights on joining the motorcycle police.

Mr. Longué, aged 79, is offered a life annuity on his provincial estate by his nephew. He receives the same, but more advantageous, offer from his insurer, but Mr. Longué has decided to undergo a rejuvenation treatment in Switzerland, at Dr. Koranoff's establishment. The effect was striking, and he was given a new lease on life, leaving his heirs and insurer in complete disarray. His wife, witnessing her husband's metamorphosis, also undergoes the treatment, and off they go on a second honeymoon to Italy.

Mrs. Vargas has decided that her daughter Alma will marry Duke Pablo Dominguez, a good match for her, but not to the young lady's taste. Knowing that discussion was pointless, Alma decided to run away rather than consent to a union she found repugnant. A brave truck driver takes her to the South of France, where she sets sail for the Balearic Islands. On the boat, she meets two friendly stowaways, Miguel and Pierrot. Penniless, Alma finds work in an inn deserted by customers. Miguel and Pierrot manage to get themselves hired to liven up the room with their songs, and they soon attract a large, mostly female, clientele.

Paris, 1956. Everything is going smoothly for Roger, married to Denise, and Paul, married to Monique, until the day they win a house in a radio contest. The difficulties of living together and the intrusion of their parents-in-law lead to a falling out.