Louis Mahé, a wealthy tobacco plantation owner on Réunion island in the Indian Ocean, is awaiting the arrival of his bride to be, Julie Roussel, whom he's never met. One day, she escapes with all his money and it turns out that her real name is Marion. She is an adventurer and, together with an accomplice, has killed the real Julie. Louis leaves for France with the idea of taking revenge and asks Comolli, a private detective, to find Marion.