Something wicked is at work in Colorados supernatural community. Vampires are being paralyzed or killed with poisona weapon favored by witches. This offense threatens to break apart the already-fractured alliance between witches and the undead. The states cardinal vampire, Maven, summons boundary witch Allison Lex Luther to stop the killing before it ignites a war. Lex has barely started investigating when she gets another surprise: the biological father shes never met arrives on her doorstep. He has answers to all of Lexs questions about her bloodline, but getting those answers could mean betraying the life shes already built. Then the next vampire is poisonedand this time its Maven herself. The new evil that hunts Lex is powerful and ruthless enough to stop the strongest supernatural creature in the state. In order to find such a killer, Lex will have to face down her own birthright and call on every allyboth living and dead.