A store owner is found dead after a brutal attack with a power drill. At the crime scene, Morgane discovers jewelry that Serge had stolen in an earlier theft. Was he using it to pay off his debts? While Morgane tries to find the culprit, she faces the challenge of keeping her own indirect involvement in the crime a secret.

Serge is discovered with a gunshot wound to his leg and confesses to owing a notorious motorcycle club a lot of money. While Morgane tries to stabilize him, she is called to a new crime scene: After a stag party, the groom's chauffeur is found dead - and in a bunny costume. In order to solve the case and raise money for Serge's debts at the same time, Morgane is infiltrated as a wedding planner ...

While Morgane and her children are still puzzling over what to do with the mysterious bundle of money behind the dishwasher, 19-year-old Salomé Rousseau is discovered dead in a dissecting room. The case quickly becomes unusual, as all the clues point to a disturbing scenario: Was Salomé a vampire? This sounds absurd to Morgane - and she sets out to find a rational explanation for this bizarre case.

Morgane and the team investigate the death of Adèle Mercier, a young mother who was executed with a targeted shot to the head. In the course of the investigation, it emerges that the unassuming victim led a dangerous double life, which may have been her undoing. As Morgane gets closer to the dark secret of the dead woman, her relationship with Karadec becomes increasingly unbalanced.

Morgane and Timothée spend a night together - but instead of clarity, this only brings new confusion. But there isn't much time to think, because the team is called to a crime scene: Yvan Desfard has been discovered dead on the side of the road. The investigation is complicated by the fact that the victim was part of a secluded hermit community. While Morgane tries to solve the complex case, she struggles with the question of what to do next with Timothée.

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.

Morgane is accused of murdering her former boss Émilie Fontaine and ends up in prison despite her persistent protestations of innocence. To help his former colleague, Inspector Karadec starts investigating. Together they reopen the case - until an unexpected twist changes everything.

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.