Mira lives in a world destroyed by disease and war, where a virus has caused all animal life to mutate into monsters, and humans themselves have become capable of monstrous acts. In the center of the dust and decay, a hidden city offers salvation to those it deems worthy. To those it does not, the city is a heartless predator, reaping those outside of its barriers to quench a sinister thirst.

When Mira's brother and sister are taken, she must risk her life to penetrate the fortress and rescue them. With the help of an old hermit rumored to have once escaped himself, Mira will face a world beyond her imagination and march through hell itself to bring her siblings back.