Nadine tries to navigate between Kevin, Patrick and the investigation which is progressing rapidly. Florence tells him that she is going to separate from her husband. Madame Chicoine in turn comes to see Isabelle to tell her that Mr. Beauvais denounced his new boyfriend out of jealousy. Jean Brière, who has been released, comes to the station where he is welcomed as a hero, but he will not obtain any inside information. Isabelle leads a brainstorm with her colleagues based on the information discovered in Martel's secret hard drive. Bruno is particularly interested in the mention of an unresolved case that dates back more than ten years.