Laurent tells Stéphane to be wary of Nadine. In a meeting, he offers him help with the investigation, but Patrick is not fooled. Isabelle and Laurent confront Mégane, the residence attendant, with evidence of her activities. They update Mr. Beauvais on the development of this file. Ms. Dulude calls to say that a suspicious person on a bicycle has been standing near the park for almost an hour. The investigators will come across a big fish but is it the right one? Nadine criticizes Stéphane for his lack of rigor. She insists on speaking again to young Raphaël who had seen Théo in the company of an adult at the park.