CHLOÉ MULLER, a federal police investigator, is sent to protect public enemy #1, GUY BÉRANGER, the most dangerous child murderer of Belgium. His release on parole to the custody of Vielsart Abbey leads to public outcry throughout the country, particularly in this small village in the Ardennes. When he arrives at the abbey, Béranger is watched over by LUCAS, a young idealistic monk to whom the abbey has entrusted the immense task of evaluating the sincerity of the ex-convict's request to enter their order. If most of the abbey's monks are suspicious of bringing "a monster" into their peaceful community, Lucas sincerely wants to believe in Béranger's redemption. But when a young girl disappears in the outskirts of the abbey, the entire village of Vielsart is in an uproar. Chloé is assigned to a dark and complex investigation that brings her face to face with the fears and secrets of the entire population of this small village, which seems peaceful in all outward appearances. Confronted by a mob thirsty for their own renegade justice and a brotherhood prepared to preserve the reputation of their abbey at all costs, Lucas and Chloé will have to join forces in order to re-establish order and truth.