1925. In the summer heat of the French Riviera, 18-year-old movie-star Rosemary meets Dick Diver. And for a moment she lives in the bright-blue worlds of his eyes. But Dick is a married man. He and his glamorous wife Nicole are at the centre of a wealthy and glittering American crowd that laze the holiday season away on the dazzling beaches. Yet, as the drama of the summer unfolds, the idyllic world of the Divers starts to shatter. A dark secret lies at the heart of Nicole and Dick's marriage. Theirs is a complicated, corrupt love - destined to leave one of them utterly destroyed.