In a future world, vampires reign. Humans are blood cattle. And one girl will search for the key to save humanity. Allison Sekemoto survives in the Fringe, the outermost circle of a vampire 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 killed her mother and keep humans as blood cattle. Until the night Allie herself is attacked - and given the ultimate choice. Die...or become one of the monsters. Faced with her own mortality, Allie becomes what she despises most.
To survive, she must work with her vampire creator and learn the rules of being immortal. Including the most important: go long enough without human blood, and you will go mad. When Allison is separated from her creator, she flees into the unknown, the world outside her vampire city, beyond the wall. There she joins a ragged band of humans who don't know what she is, seeking a legend - a possible cure to the disease that killed off most of humankind and created the rabids, the mindless creatures who threaten humans and vampires alike.