A New York Times bestseller! Patrick Ness's Carnegie Medal-winning masterwork is poised to attract a discerning crossover audience. The monster in Conor's backyard is not the one he's been expecting -- the one from the nightmare he's had every night since his mother started her treatments. This monster is ancient. And wild. And it wants something from Conor. Something terrible and dangerous. It wants the truth. From the final idea of award-winning author Siobhan Dowd -- whose premature death from cancer prevented her from writing it herself -- Patrick Ness has spun a haunting and darkly funny novel of mischief, loss, and monsters both real and imagined.