Season 4 - Caïn

When a woman and her daughter are abducted at gunpoint, Cain thinks the family is involved. Meanwhile, Lucie and Borel feel the heat when they're investigated about Carsenti's death.

Cain and Lucie team up to solve the brutal murder of Lea Legendre, a 17-year-old student. The investigation leads them to Etienne Courcelles, an unorthodox and manipulative media professor.

Lucie is shot in the neck while she is waiting for a date but no one sees who fired the shot. In a fury of fear, Cain pulls out all the stops to find the culprit while Lucie is on the operating table.

Joelle Lester, the director of the clinic where Lucie was treated, is found dead. Joelle's sister Charline is sure she was the real target. Did the killer make a mistake? Cain and Lucie have doubts.

The body of a student who lived a secret life as a prostitute is fished out of the water. Cain tracks down some shady characters, not the least a Mafia boss who thinks he is untouchable.

Lucie is forced to participate in a deadly act and her life is on the line as she could be exposed at any moment. Meanwhile, Cain wants to catch Virandelles red-handed.

A criminology student falls from the roof of his campus. Cain discovers that the trail leads to a famous criminology professor, Anna Becker, who has far too much influence over some of her students.

Who gains when star dancer Cyril is poisoned during a performance? Suspects include a rival dancer, the Balletmaster and Cyril's lover who is worried he'll leave her. Cain digs deep to find out.