A year after leaving the police force to become a maid again, Morgane becomes a private investigator; she is hired by Emilie to find out who is behind the mysterious events that torment her.

Morgane finds herself in prison, accused of a murder she did not commit; she tries to adapt to the prison environment while trying to resolve the crime behind bars.

Morgane has to solve the murder of 20 year old Naïma; Morgane will have to get out of this hellish whirlwind by reconnecting with Karadec.

Morgane will have to solve Adele Mercier's mysterious crime, killed with a bullet between her two eyes, while her relationship with Karadec gets more and more complicated.

Salomé Rousseau, 19, was found dead in middle of a dissection auditorium; the investigation takes a rather distressing turn when all the evidence leads us to think that the victim was a vampire.

Serge, a bullet lodged in one of his legs, reveals that he owes money to a biker group; while Morgane, helped by her children, tries to stop the bleeding, she is immediately called to a new crime scene.

The owner of a jewelry store is found dead as a result of an attack with a drilling machine; at the crime scene, Morgane recognizes the jewelry that Serge stole in the past.