Isabelle Bonnefoy, a famous sailor, is sailing with her son when she receives a distress signal. When they arrive, they discover a headless body floating in the water.

Isabelle Bonnefoy is sailing with her son Noe when they received a distress signal.Some minutes later they discover a headless corpse in the water.The dead man is Cyrille Bollier, who was sailing on his boat Esperanza.The commandant Nicolas Lemeur is in charge of the criminal investigation.Isabelle and Nicolas are surprised to meet each other now.The first suspect in this case is Lionel Colignon, a old friend of Isabelle.Lionel tells to Nicolas that Cyrille was a drug trafficker.Then the police finds rests of the Esperanza with several drugs , an ax and money.The investigation now moves toward to young men, Alex Guillou and Jules Talamont, but Isabelle and Noe think that Alex Guillou is not guilty.One night Alex, Jules, Noe and his girlfriend Anais disappeared.Now the investigation goes around an old story of the island; Pilar, a Spanish refugee died in the fire of her.But her grandson Enrique survived and now he is looking for revenge.