Hardly a day goes by when nine-year-old Laurent Lepage doesn't cry wolf. From alien invasions, to walking trees, to winged beasts in the woods, to dinosaurs spotted in the village of Three Pines, his tales are so extraordinary no one can possibly believe him. But when the boy disappears, former Chief Inspector Armand Gamache is faced with the possibility that one of his tall tales might have been true.And so begins a frantic search for the boy and the truth. What they uncover deep in the forest sets off a sequence of events that leads to murder, leads to an old crime, leads to an old betrayal. A monster once visited Three Pines. And put down deep roots. And now, it is back.