After surviving through the zombie apocalypse, humanity has created enclosed cities to protect its citizens. 50 feet high walls surround every Zone, but that doesn't mean the fight is over. Zombies are still out there, banging against the concrete, incessantly moaning. And every person is infected. When you die, you turn. Travis lives in Zone 7, a middle class, hard working city. His mother is extremely ill and the Red Chains have given him a choice: Toss her out into the wild and let some rogue zombie find her, or kill her himself. The Red Chains won't allow anyone to die and turn, and start another apocalypse.