Teenage student Olivier (Verley) meets 25 year-old Frédérique (Delon), wife of race car driver Enrico (Hossein), and start an affair. But guilt and doubt storm over Olivier's mind.

Olivier, a seventeen-year-old high school student, is a good-looking young man, much more mature than most of his schoolmates. One day he meets Frédérique, 25, a beautiful woman who attracts him strongly. The trouble is that she has a life companion, race car driver Enrico. For the time being, Enrico is away in Detroit to test a new prototype and Frédérique is idle in Paris that is why she welcomes the young man's company. Slowly but surely, the friendship turns into an affair, for Frédérique finds she shares Olivier's feelings. But Enrico finally comes back to Paris. Will Olivier and Frédérique's love story be possible in these conditions?—Guy Bellinger