The body is identified as little Alex Dorin. Tensions are rising in the city because at the time, three children were missing: Alex, but also Cyril and Elsa, who were Lieutenant Romain Valant's best childhood friends. Noémie's teammate is devastated, but is determined to continue the investigation...

As Jean Casteran emotionally explains his illicit activities, a devastating fire breaks out at the Dorin farm, the parents of little Alex. Jacques Dorin is the ideal suspect, and the team focuses on his actions, pushing him to his deepest limits. At the lake, all the barrels are brought to the surface, and the village can finally bury its dead. But one mystery still remains... What happened to little Elsa, whose body has not been found?