There's a high price tag on the head of Selene Coldbane since she's the only surviving day-walker in existence. Life's even more complicated now that she carries a child fathered by a nephil, the greatest threat to vampires. The Nephilim army declares war when Selene's abducted. The human race hangs in the balance of one day-walker and one nephil.

Sheltered in a dome city, Emery thinks she's safe from the worst dangers possible. But when her brother contracts a deadly disease, she crosses the Wall of Fire in a desperate move to save his life. When her plan goes awry, she’s thrust into a gauntlet of trials she must pass or face exile. Suddenly, everything is in question, and figuring out who to trust becomes a matter of life or death.