Les rivières pourpres - Season 3 (2021)

Niémans and Delaunay continue investigating the death of his former colleague from buboes.

In a small Belgian village, a church catches fire. As the firefighters battle the flames, the scene of a dark spectacle is revealed before their eyes: two bodies, a man and a woman, sewn back to back and with their throats cut. Camille and Niemans, arrived on the spot, discover on the victims bracelets from a neo-pagan festival with strange rituals, perched in the mountain. Niemans finds a former colleague and friend, Audrey, who works in the Belgian PJ. Very quickly, this investigation brings the trio into the strange world of neo-pagan rites and leather tanneries.

Niémans and Delaunay continue to investigate the siblings in the leather factory, while the mystery in the the festival continues.

Niemans is called in the middle of the night by Marek Volsnic, a former robber who seems to know him well. As he rushes to the spot, Marek is found unconscious by a guard in his cell, alongside another comrade, mutilated face, lacerated body, eyes gouged out. Niemans, with the agreement of the prison director, investigates under the radar with the help of Camille.

Niémans and Delaunay continue investigating the murders inside the prison. Niémans's past is revealed.