Detective Dave Robicheaux, his wife Molly and daughter Alafair are vacationing in Montana. But evil, it seems, has followed them into this wild paradise. Someone is stalking Alafair, and Dave begins to suspect that it's a convicted serial killer she interviewed two years ago - even though he's supposed to be dead. Is Alafair the target of a depraved serial killer, or has she unwittingly crossed paths with a murderous psychopath closer to home?