When a mysterious figure appears in Three Pines, Armand Gamache and the rest of the villagers are at first curious. Then wary. From the moment its shadow falls over the village, Gamache, now Chief Superintendent of the Sûreté du Québec, suspects the creature has deep roots and a dark purpose. Yet he does nothing. What can he do? Only watch and wait. And hope his mounting fears are not realized. But when the figure vanishes overnight and a body is discovered, it falls to Gamache to discover if a debt has been paid or levied. Months later, as the trial for the accused begins, Chief Superintendent Gamache continues to struggle with actions he set in motion, from which there is no going back.