A year ago, Morgane turned her back on the police and, with her rebellious nature, moved from one odd job to the next. Most recently, she worked as a cleaner for Émilie Fontaine, a successful woman who can't shake the feeling that she is being followed, which is why she drowns her fears in alcohol. Morgane suggests she look into the matter, but what begins as a harmless favor ends in a mysterious case with a fatal ending.

Morgane returns to police work after a long break, although her strained relationship with Karadec continues to be a burden. A new case brings distraction: the up-and-coming rapper Naïma has been murdered. The investigation reveals that Naïma was working on a song about sexual abuse - a controversial topic that may have been her undoing.