Simone investigates a new murder, and Henri does not believe that Jules is the murderer she is looking for. Accompanied by Henri, Xavier meets Dr. Aberdeen. Nicolas' condition is getting worse, and the psychiatrist tries to help him recognize it. Jules can no longer take the manipulations of Angel – who orders him to be murdered – and tries to get rid of this twisted mentor.

Simone and Danno's investigation stalls. Henri goes on his first date with Francine. William sees Laure again, which troubles him. Jules ends up obeying Angel. Pierre informs Henri and Dr. Riendeau of his concern about Jules. The two psychiatrists clash over Riendeau's participation in the trial as an expert witness. Diane returns apparently radiant from her vacation.

Paule Lachapelle, who has lost all inhibitions, makes quite a scene when her daughter Maryse takes her to INSM. William enlists Marine's help to make a difficult announcement to his father. Henri confides in his psychologist, Henri-Martin Chabot. However, the insistent attitude of the latter on the investigation intrigues Henri. Simone can't get Jules out of the potential suspects.