An encounter. Between waves and cliffs. The night. In a week, he gets married. For years, she no longer believes in pleasure. They meet. They play. They speak. They want each other. As a gift - unconditionally. Like a dance - on the edge of the void. For one night. One night only. Their only night.

The Bouvier-Sauvages, a large aristocratic family, meet the much more modest Martin family when their children's wedding is announced. For the occasion, the future bride and groom offer their parents DNA tests, which will reveal their true origins. The results are totally unexpected and will make the effect of a bomb.