New elements allow Judge Lambert to order the custody of a potential suspect in Grégory's death, under the eyes of raging journalists. This arrest sows disorder in the Villemin family. For their part, the gendarmes question the suspect's sister-in-law…

While the gendarmes believe they have the culprit for Grégory's death in the person of Bernard Laroche, their witness reconsiders his confession, which seems to bring the investigation to a standstill. But new unexpected witnesses quickly bring to light a new theory...

The gendarmes were removed from the investigation and replaced by the Nancy SRPJ, led by Commissioner Corazzi, convinced of the guilt of Christine Villemin, the child's mother. Feeling abandoned by everyone, Jean-Marie plans to take justice into his own hands...