When a dying man stumbles into David's yard, convinced he knows a cure for the Plauge, he decides to follow the old map pushed into his hand by the man to see if what he said is true. With Tamora, Macee and Alex at his side he sets off on an epic adventure to save the infected world. And let's not forget Chong, completely pissed that a bunch of kids thought they could go off by themselves into an infected city without adult supervision.