Positive

The tattooed plus sign on Finnegan's hand marks him as a Positive. At any time, the zombie virus could explode in his body, turning him from a rational human into a ravenous monster. His only chance of a normal life is to survive the last two years of the potential incubation period. If he reaches his twenty-first birthday without an incident, he'll be cleared.
Until then, Finn must go to a special facility for positives, segregated from society to keep the healthy population safe. But when the military caravan transporting him is attacked, Finn becomes separated. To make it to safety, he must embark on a perilous cross-country journey across an America transformed-a dark and dangerous land populated with heroes, villains, madmen, and hordes of zombies. And though the zombies are everywhere, Finn discovers that the real danger may be his fellow humans.