Saint-Barth is reeling from recent revelations about his past when he is called to a new crime scene. Célia Gomez, a young nurse, was found dead in her convertible, a syringe stuck in her heart… The Saint-Barteam discovers that she was sleeping in the back room of a nightclub and that she was using her nursing skills for not very legal purposes. To shed light on this new mystery, Saint-Barth will have to investigate the world of partying. A journey to the end of the night from which he will not emerge unscathed… Fortunately, his old friend Auguste is there!

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?

Tom Mirel's body is found on a beach, impaled by a swordfish! Problem: the fish died before the surfer... So it's murder. When he gets back on the victim's board, Saint-Barth understands that Tom was fighting with his team for eco-responsible surfing. But was this noble cause really unanimous among the small group of teenagers with distant family backgrounds? Saint-Barth is finding it increasingly difficult to hide from Lou that he is her father. But he promised Avril not to say anything...