Claire Péron

Pauline has her own way of doing road safety: as a trainer in a point recovery center during the day, she becomes a serial killer of drivers at night.

Emergency medicine intern Margaux can no longer stand it. During another very hectic and patient-filled shift, she forgets a homeless woman on a stretcher who then dies. Shocked Margaux has no choice but to continue working. But suddenly, her body starts sweating blood uncontrollably.

Back in Brittany, Captain Morgane Ledantec is confronted with the discovery of human bones after the fall of a sacred oak during a storm. The victim was a follower of druidism which Morgane was introduced to as a teenager by her godmother.