A virus has laid waste to civilization, turning the infected into flesh-eating and mortally contagious zombies. But events have stabilized, and the rebuilding process has begun. Over a three-day span, “Mark Spitz” and his fellow “sweepers”—other survivors of the apocalypse—patrol portions of New York City, eliminating zombies as part of a mission to make the city inhabitable once again. Flashbacks pepper the narrative, explaining how “Mark Spitz” survived the apocalypse to date and got his nickname along the way.