Mathilde, Phil's sister, arrives on the island to reconnect with her brother. During a walk, they are the target of a gunman. They managed to escape the bullets of their attacker, who rushed after them. Put on alert, Mélissa and Gaëlle discover that Mathilde is a scammer who has scammed dangerous people. Their fear is redoubled when they discover the body of her partner at Mathilde's home.
