The Squad must review the file of Corine Vaillancourt, who has been missing for six years. While Renaud and Lily-Rose analyze the file, they discover an important detail that Marc-André had put aside when he was in charge of the investigation. Dominic and Penelope must team up to help the many victims of the attack and thus reconcile work and feelings... Renaud learns some news about Marilou, he is again in shock!