The body of Roméo Saldes, an educator for troubled teenagers, is found drowned in the Punch Pond. Captain Ophélie Villedieu is in charge of the case, assisted by Alban, her young Guadeloupean subordinate. Commander Léopold Lacarrière from Versailles regional police department, is back on his native island with the project of writing a police novel. But when he arrives, his god-son Pierre-Henri is nowhere to be found : Léo learns that he had been in prison for a couple of months after a car robbery. Roméo, as his former educator, had reported him to police rather than risking him committing a worst infraction later. Pierre-Henri had then publicly threatened to kill him.
—Happy_Evil_Dude