Celine is given permission to reopen the Emma Perrin case. A seven-point ladybug stuck to Emma's windshield reveals to Morgane that she must be in Brittany. There, she and Karadec meet a survival troop.

The case of the strangled Dr. Guillot, whose colleague Dr. Xavier Decker is suspected by Morgane from the outset, is a headache. The time of death can only have been during the period for which Dr. Decker has a solid alibi.