Parental responsibilities catch up with Henri in the middle of the night, when he receives a disturbing call from Alice who has lost track of Marine. Still very vulnerable, the latter took refuge with her new friend Tristan. An article in the media reports that the investigation into the murder of Anne Beaulieu is going in circles. Stung, Simone and Danno redouble their ardor and refine their strategy to corner Mark Cohen, who has become their main suspect. Helped by Louise, Henri draws up a list of potentially suspicious names. Jules Côté, a former patient who recently left the Institute, could he be the perpetrator of the crime?

At the Institute, Henri spends a stormy day in the presence of his patients. At Simone's request, Laure goes to the police station. The meeting suddenly becomes very intense and has serious repercussions for his brother Toby. A reversal in the investigation particularly concerns Henri, whose certainties crumble one by one. Anne did not tell him everything. Simone is there to support her as she herself sees her personal life fall apart.