"Mercy Thompson inhabits two worlds without truly belonging to either. To the human inhabitants of the Tri-Cities she's an oddity, a female mechanic operating her own garage. To the town's darker residents, werewolves, vampires, and fae, she's a walker, a last-of-her-kind magical being with the power to become a coyote. Mercy warily straddles the fine line dividing our everyday world from that darker dimension. Until a boy — mauled by vicious werewolves and forever changed by the attack and on the run from those who committed the crime — appears at her door. Now her two worlds are about to collide. Outnumbered and out-muscled, can Mercy possibly save the boy? Or even herself?"