A police detective investigates the mysterious disappearance of a young boy, leading him to uncover a dark world of child abuse and pedophilia. As he delves deeper into the case, he must confront his own demons and face the truth about the horrors that lie within the community.

After a hand is discovered in a Brussels canal, Belgian police diver Kiki confronts her own deep guilt and the dark secrets of her past. Adapted from Mo Hayder's book 'Ritual'.