Five years have passed since the Fall of the planet to the hordes of mindless, savage undead. Those not killed have learned to eke out a life of survival.
The Ryder family is one such group, but when their father falls ill, siblings Jim and Katy must travel back into the nearby city of Baker's Fort to get medicine. Katy sees this as an adventure, but Jim is haunted by the memories of the last days in that city.
While the wodies--short for "walking bodies"--are a threat, Jim and Katy soon learn the Clans of survivors in the city are much more dangerous. The siblings strike a deal with one such Clan: Help the Clan, get the medicine they need. What starts as a supply run, however, quickly spirals out of control.
As Jim and Katy travel further down the dark rabbit hole, they enter increasing horrors beyond their imaginations. Jim promises not to repeat the past, but can he stand against a darkness so great? Can Jim learn to resist the lifestyles the Clans have adopted, or will he find that savagery really is our truest nature?