"Since the dark events that scarred her childhood, Kier Templer escaped her hometown to live life on the road. She and her twin have never lost contact until, on a trip to a Portuguese national park, Kier vanishes without a trace. Detective Elin Warner arrives in the same park ready to immerse herself in its vast wilderness--only to hear about Kier's disappearance, and discover a disturbing map she left behind. The few strangers at an isolated campsite close ranks against Elin's questions, and the park's wild beauty starts to turn sinister"--