Let there be…war? Now aware of their role in a peace agreement between Heaven and Hell, teenagers Rose Hornsby and Zachary Halo must deal with a pact that sent Hell's infant heir to a loving and nurturing home…and Heaven's infant heir to a home of deep cynicism and corruption. All engineered with the promise that each child develop a more nuanced insight into coexisting with ancient enemies. Only one problem: the kids want nothing to do with it. Oh, and one more problem: a rogue angel and demon make a blood pact to unravel the hard-fought peace and rekindle the flames of war. With Rose and Zach's backs to the corner, they must make a fateful choice: embrace their destiny…or destroy the cosmic order of the universe. Collects HORNSBY & HALO #7-13.