Something wicked is at work in Colorado s supernatural community. Vampires are being paralyzed or killed with poison a weapon favored by witches. This offense threatens to break apart the already-fractured alliance between witches and the undead.The state s 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 ather surprise: the biological father she s never met arrives on her doorstep. He has answers to all of Lex s questions about her bloodline, but getting those answers could mean betraying the life she s already built.Then the next vampire is poisoned and this time it s Maven herself. The new evil that hunts Lex is powerful and ruthless eugh 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 ally both living and dead.