Margot Rimel was locked in a shark cage eight meters deep, until she died. Who could have been so cruel to this young oceanographer? By diving into the depths of the ocean, Saint-Barth discovers that her murder is linked to a pearl of inestimable value, an object of desire and the bearer of a terrible curse... On the private side, the past also comes to the surface and the revelations that Saint-Barth will have to face will be breathtaking...

Saint-Barth and Commissioner Baccara are attending a reception at the prefect's when a parachutist falls from the sky in the middle of the buffet! However, Matteo Coloni was dead before his landing. But who could have killed this freefall instructor in mid-flight? By getting under the victim's parachute, Saint-Barth discovers that behind his leisure activity, Matteo was not only landing thrill seekers on the island... Saint-Barth and Deborah are getting closer... Will Avril be as insensitive as she thought?