Two more people are shot dead, in the cemetery: a married couple who took in foster children. But a quotation from an ancient tale about an ill-fated group of children on a memorial provides a clue.
A child's severed hand is found in the village of Roubaix. Niemans and Camille find the local authorities uncooperative but uncover a link to a local orphanage. Their investigation leads them to the cold case of 3 serial murders and a spate of child abuse cases dating back 20 years.