Freed after 20 years in prison, the child killer Guy Beranger found refuge with the monks in Vielsart, a small village in Belgian’s Ardennes. He is placed under the protection of a young Federal Police’s inspector, Chloé Muller. A little while after his release, a little girl disappears.

In the small bordertown of Villefranche, lost in the heart of a large forest, crime rate is six times higher than elsewhere in the area. Each new crime Major Laurène Weiss solves with the help of her unusual team makes her sink deeper and deeper into secrets of the area.

A young female detective is put in charge of a case and must delve into her partner’s mysterious past in order to solve it.