Leah has joined the Pyros, a group of warriors with astonishing powers, who fight the fiends who wiped out most of life on earth. But their worst enemy is one of their own. Jared, the sadistic scientist who betrayed the Pyros, has captured Leah's ally, Cas. To get him back, she must leave her new friends and face the wilderness alone. But Jared's not the only threat out there. The fiends are moving, forces stir on the other side of the divide, and if Jared's plan succeeds, it'll spell disaster for their world. And that's if the dark transformation in Leah's blood doesn't kill her first.