American psychoanalyst Dick Diver and his wife Nicole live in a villa on the French Riviera, surrounded by a circle of glamorous friends. When beautiful film star Rosemary Hoyt arrives she is drawn to the couple - Dick contemplates an affair, while Nicole believes she's found a new best friend. But a dark secret lies at the centre of the Divers' marriage. A secret which could destroy Dick and Nicole and those close to them . . .