From author's website: Eighty years into the future, the United States is a no-man's-land: its landscape blighted by chemical warfare, pollution, and plague; its government collapsed; its citizens adrift, desperate, fighting to stay alive. In fortified compounds, survivors hold the line against wandering predators, rogue militias, and hideous mutations spawned from the toxic environment, while against them all stands an enemy neither mortal nor merciful: demons and their minions bent on slaughtering and subjugating the last of humankind.

But from around the country, allies of good unite to challenge the rampaging evil. Logan Tom, wielding the magic staff of a Knight of the Word, has a promise to keep—protecting the world's only hope of salvation—and a score to settle with the demon that massacred his family. Angel Perez, Logan's fellow Knight, has risked her life to aid the elvish race, whose peaceful, hidden realm is marked for extermination by the forces of the Void. Kirisin Belloruus, a young elf entrusted with an ancient magic, must deliver his entire civilization from a monstrous army. And Hawk, the rootless boy who is nothing less than destiny's instrument, must lead the last of humanity to a latter-day promised land before the final darkness falls.

(Source: Del Rey)