The body of Valentin Bélliard, 17, is charred in his parents' barn and the investigation seems to be heading towards an accident although for Morgane it is a murder. Murder probably related to the fact that Valentin led a double life: a secret apartment, a mysterious girlfriend and another job. At the same time, Morgane is looking for a new home with Ludo. Finally, an attempt is made to discover the true identity of Karadec's new girlfriend.