Yves Harteloup, scarred by the war, is a disappointed young man, old money fallen on hard times, who returns for the summer to the rich, comfortable Atlantic resort of Hendaye, where he spent blissful childhood holidays. He becomes infatuated by a beautiful, bored young woman, Denise, whose rich husband is often away on business. Intoxicated by summer nights and Yves' intensity, Denise falls passionately in love, before the idyll has to end and Yves must return to his mundane office job.
     In the mournful Paris autumn their love founders on mutual misunderstanding, in the apparently unbridgeable gap between a life of idle wealth and the demands of making a living, between a woman's needs and a man's way of loving. As Denise is driven mad with desire and jealous suspicion, Yves, too sure of her, tortures himself and her with his emotional ambivalence. Taking her sophisticated mother's advice, Denise takes action... which she may regret forever.