When a half-human, half-demon is forced into a contract with an amateur demon hunter, he finds her goal of revenge is the least of his problems. Isaiah Bright's contract places him at the center of a conspiracy to destroy the Gates of Purgatory - a conspiracy that may end the uneasy peace between the Infernal Host and Angelic Choir. Is the power of a halfblood all that stands in the way of another Celestial War?