Morgane, Ludo and the children have moved in with Gilles, who can't imagine how the roof has fallen in on them. Commissaire Hazan informs Karadec that Morgane is suspended until further notice and will be investigated by Roxane Ascher of the IGPN. When she is told that she can't help in the case of a woman in her thirties who was shot twice, Morgane gets mad. DNA reveals that the corpse corresponds to lieutenant Laëtitia Keller, a policewoman.

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.