Raised in a family of demon hunters, Blair Murphy has her own personal demons to fight -- the father who trained, then abandoned her, and the fiance who walked out on her after learning what she is. Now she finds herself training a sorcerer from 12th century Ireland, a witch from modern day New York, a scholar and a shape changer from the mythical land of Geall, while trying to keep herself from staking the sixth of their circle and host: a vampire sired by Lilith, the vampire queen they've been charged with defeating.