Only one thing is certain: when Hallows' Night comes, the Wild Hunt will ride - and it feeds on mortal blood.
Cat and her cousin Bee are caught in a maze of intrigue, treachery, and magic. Everyone seems to want something from them: the Cold Mages are trying to take them prisoner, and the warlord who wants to conquer all of Europa seems sure they have a special destiny to aid him whether they want to or not. Worse, hidden powers deep in the spirit world are rising, and they are the most dangerous of all. Cat must seek allies and figure out who she can trust in order to save the ones she loves. For if she doesn't, everything will be lost.