Ruth is the daughter of a sergeant-major and engaged to a sergeant who is overseas. Guy is a young officer who becomes infatuated with Ruth and encourages her to cross the social divide by attending functions in the officers' mess.The sergeant returns and there is a confrontation. Ruth leaves to stay with relations and becomes the mistress of a rich playboy and known as La Marina on the French Riviera.While holidaying on the Riviera Guy happens to meet Ruth,which leads to a series of bizarre events.