The story picks up several weeks into the Zombie incident, showing the first incarnation of the Hunters, and then flashes back to the first time they actually sought-out the carnivorous bodies with the intention of exterminating them.
As the situation grows more deadly, the Zombie Hunters go searching for a young girl who has gone missing from a nearby park. Can they find her in time before the zombies claim her?
Billy Cassidy visits St. John's Hospital in the hope that his paramedic girlfriend, Judy Moskowitz, has returned. But the hospital staff has their hands full protecting both themselves and the patients when a zombie gets loose in the building.
Cassidy, pushed by Bates and Joey, takes all their money to buy some guns from a small group of survivalists. But something isn't right about these "survivalists" and if they aren't careful, zombies will be the least of their concerns.
illy Cassidy and Paul Michael Bates vow to get revenge on the militia group after the weapons deal does wrong. In their haste, Bates and Cassidy leave their wounded friend Joey with nurse Carrie Walker and Dr Rebecca Kaufman.
The group realizes that the Zombie infection may not be an infection at all. Billy, conflicted by his Irish Catholic guilt, needs to confront his demons and he seeks out the advice of a childhood mentor. Meanwhile, Bates decides to leave the group and goes off on his own in order to liquidate some of the assets he acquired when they dealt with the militia. However, he soon learns that there's greater safety in numbers when he tries to make a new deal with a house full of sociopaths.
Billy Cassidy and his group have a meeting with Dr Rowena Lambick, a scientist who claims to have developed a cure for the zombie plague. Moreover, Cassidy and company team up with another vigilante group from the Bronx for a raid on a warehouse.
Following the horrific events of the previous month, the government claims to have put an end to the undead problem. But the zombie hunters are suspicious of this good news, and with good reason: a terrorist group aiming to exploit the recent resurrections are planning a horrific crime!
The aftermath of the terrorist attack on the Koala Chemical plant is swift and violent, with hundreds of thousands of re-animated corpses spreading out in both directions from central Long Island. John and his family are trapped in Suffolk County and the Zombie Hunters decide to brave the onslaught and try to rescue them. But they are cornered behind a building that has already been claimed by a group of looters. When the National Guard arrives with orders to shoot anything that moves, these unlikely allies have to band together to survive the rest of the night.