Coyote shapeshifter Mercy Thompson is attacked and abducted in her home territory. Fighting off a crazed werewolf, she manages to escape, only to find herself alone in the heart of Europe, without money, without clothing and on the run from the clutches of the most powerful vampire in the world.

Unable to contact her pack, Mercy has allies to find and enemies to fight, but first she needs to figure out which is which. Ancient powers stir, and Mercy needs to be at her agile best to avoid causing a war between vampires and werewolves - and between werewolves and werewolves. And in the heart of the ancient city of Prague, old ghosts rise . . .