An American agent disappears after a scuba diving reconnaissance mission in Corsica. The Secret Service sends agent code name OSS 117 to investigate.

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.

Véronique Lanier runs one of the most highly rated haute couture houses in Paris. Her first partner is her husband Pierre, who has left aside a promising artist career to design the styles which make their firm a success. The trouble is that Véronique lives only for her job and does not allow herself -and her husband for that matter - a moment's respite. In Cannes, Pierre meets Wanda, a young singer with strange, fascinating eyes. The frustrated husband falls for her but gradually realizes that the light mercurial creature cannot possibly fulfill him. Véronique, feeling miserable, understands she is on the wrong track. She promises Pierre that she will make efforts to reconcile work and married life. Véronique and Pierre will live and work together again, each one forgiving the other for their faults.