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?

In Avalone, it's shocking. In place of the little girl believed to be dead, stands a young woman, radiant and very much alive. The investigation then takes a new turn. Elsa explains her strange disappearance, revelations that take Romain back 23 years and deeply destabilize him. Will Noémie manage to shed light on this strange cold case? And will she succeed, through this investigation and Hugo's unwavering help, in overcoming her own personal drama... and perhaps breathing new life into her life?