Allison survives in the Fringe, the outermost circle of a walled-in city. By day, she and her crew scavenge for food. By night, any one of them could be eaten. Some days, all that drives Allie is her hatred of them; the vampires who keep humans as blood cattle. Until the night Allie herself dies and becomes one of the monsters. Forced to flee her city, Allie must pass for human as she joins a group of pilgrims seeking a legend, a place that might have a cure for the disease.