Joe Ledger, a leader of the Echo Team for the DMS (Department of Military Service), was a cop but is now a hero. Joe is in charge of a group of four other fighters who all had to go on their first mission after only one day of training. The Echo Team fights infected "dead" people called walkers. Walkers are dead, zombie-like creatures who feed on living flesh. On the Echo Team's first mission, they arrived at an old meat packing plant in Delaware. There they fought many walkers and left the plant deserted. On their second mission, they fought so many walkers that all of the men ran out of ammunition. This group of men, the Echo Team, are faced with many heart-racing challenges of saving the world from walkers.