A woman is found dead in the steam room of a spa. She looks 20 years younger than she is. Investigations take Niémans and Delaunay to the next village.

The body of another spa client is found. What's the connection between the village, the spa director whose clients are being killed and the legends that seem to terrify everyone?

Niémans and Delaunay explore the dark side of the human soul, along a road dotted with unexplained deaths. Their bond strengthens when Camille's son gets into a desperate situation.

Camille finds a cryptic note from the killer in her jacket. A second murder occurs while relics are stolen from a nearby town.

The body of a black woman is discovered with a hash symbol carved into her forehead. Investigations lead the detectives to a migrant camp.

Camille meets the Professor, an authority figure at the camp. When a second body is found, the mystery deepens. A demon myth is terrifying the migrant camp. His calling card is a carved hash symbol.

The butler of the Monferville estate finds a 17-year-old in a pitiful condition. The teenager claims to be Herminien, a son of the family who disappeared 6 years ago. Camille is looking for her son Léo.

Camille suspects her son Léo is pretending to be the missing boy. What a shock when the grieving mother confirms that the boy is Herminien. The case takes a new turn when a DNA test reveals no match between Camille and Léo.

A school bus is hit by a train. Niemans and Delaunay investigate a chain of murders. The murderer leaves a claw mark.

A school bus is hit by a train. Niemans and Delaunay investigate a chain of murders. The murderer leaves a claw mark.

At an art school, a student is found dead, drained of her blood. Niemans and Delaunay are called in to investigate. As the strange deaths at the art school continue, the suspicions turn against the teacher Lilith.

Camille Delaunay is invited by Chloé to investigate a murder in the thick of the woods. Psychologist Eva, Chloé's childhood friend, helps them. Niémans comes to help Camille and solve the ritual murder.

Niemans and Delaunay escort a serial killer - Philippe Cernac, known for hunting his "prey" with a bow - to an experimental prison/treatment centre where psychopaths of all kinds are dealt with... Cernac escapes, but caught by Niémans, who's still trying, with his partner Camille, to find the killer.

Camille Delaunay is invited by Chloé to investigate a murder in the thick of the woods. Psychologist Eva, Chloé's childhood friend, helps them. Niémans comes to help Camille and solve the ritual murder.

Niémans comes to help Camille and solve the ritual murder.