A bold new world where the magical and mundane co-exist in an uneasy alliance—and a cop balanced on her own knife-edged struggle is their only hope against a cold-blooded killer. Lily Yu is a San Diego police detective investigating a series of grisly murders that appear to be the work of a werewolf. To hunt down the killer, she must infiltrate the clans. Only one man can help her—a were named Rule Turner, a prince of the lupi, whose charismatic presence disturbs Lily. Rule has his own reasons for helping the investigation—reasons he doesn't want to share with Lily. Logic and honor demand she keep her distance, but the attraction between them is immediate and devastating-and beyond human reason. Now, in a race to fend off evil, Lily finds herself in uncharted territory, tested as never before, and at her back a man who she's not sure she can trust.