Lost in the Vermont wilderness, 9-year-old Henry sees something terrible. When a young woman is found shot through the heart with an arrow, former Army MP Mercy Carr thinks that something is murder. But Henry, a math genius whose autism often silences him when he should speak up most, is not talking. In this sequel to A Borrowing of Bones, Mercy and her dog Elvis must team up with game warden Troy Warner and search-and-rescue dog Susie Bear—to find a killer before he finds Henry, and before a blizzard traps them all in the woods.