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Mariana (Romy Schneider) is riding along with her weekend date when she infuriates him by insulting his virility. The irate man drives off a high cliff and crashes into the ocean. She emerges unscathed and she is rescued by the victim's brother. Mariana and the brother become lovers, but he soon believes she may have killed his sibling. The other brother miraculously appears and Mariana kills him and buries his corpse in the garden. The brother has already supposedly identified his brother's body before the victim returns. The police wait for the lovers to return when the rain washes away the soil and exposes the victim's body in this suspense story with a decided lack of tension.