After the Gates of Purgatory opened, the halfblood demon Isaiah Bright thought his days of excitement and adventure were over. But when the first Horseman of the Apocalypse appears before him, his mage partner Tink, and the angel Caleb DeMarco, his adventure is just beginning. Once again, the fragile peace is threatened, but this time, Isaiah isn't the one to stand in the way of the war. He's the one who starts it.