The Crimson Rivers follows detective Pierre Niémans and his partner Camille Delauney as they investigate a series of gruesome murders in remote regions of France. The circumstances behind the violent crimes are often mystical, based on regional myths. The third season takes them to
- the sinister world of pagan rituals and leather tannery
- on the tracks of a serial killer obsessed with zodiac signs
- on the heels of a psychopath intent on releasing the plague
- and behind the walls of a prison located at the highest point in Europe.
