A child murderer released on parole, Guy Béranger is welcomed by the monks of the abbey of Vielsart, a quiet little village in the Ardennes. He is placed under the protection of Chloé Muller, a young federal police inspector, convinced that, sooner or later, the former criminal will re-offend. While the population is indignant at the presence of Public Enemy No. 1 in their neighbourhood, the police learn of the disturbing disappearance of a young girl from the village ...