Marie Kermeur, a cop, comes back to the island where she was born to get married. When one of her brothers is killed, she decide to investigate the murder. Her investigation will reveal the many secrets of the island's population.
The captain of the tugboat Cyclone, André Laurent, rushes off to save the Mirva. He abandons his sick wife Yvonne and the couple celebrating their marriage. In the early morning, the Cyclone tugs the Mirva ashore with Catherine aboard.
