Since a devastating, morphing plague swept through human and zombie populations, almost everyone who survived is an 'ex' these days. Ex-human. Ex-zombie. Both creatures crave flesh, have the strength and speed of predators - and what seems like immortality. Pierced skin and broken bones mend, but their all-consuming hunger never dies . . .

Amy is the only purely human survivor from town - a frail. Her mother is gone, but she won't believe that she's dead. Feral dogs stalk her, in reality and in her imagination. Amy thinks she's losing her mind. But when an ex-human named Lisa saves her life, a fragile friendship forms, a bond that will save Amy over and over again when she and Lisa are abducted into a makeshift community run by exes who use humans as their slaves.

For a girl who is used to going it alone, trusting anyone isn't easy, but Amy will have to. She has secrets from her past she can't afford to face by herself, and secrets in her future that will cost her just about everything - including her humanity . . .