Dave uncovers the conspiracy behind the plague. The lesson? Trust no one. After months of fighting the endless hordes ravaging Tres Marias, Dave Pulaski and his wife, Holly, catch a break. Black Dragon Security suddenly shows up in full force to rescue them. The paramilitary organization sets up a safe zone. They provide food and shelter for the bone-weary residents, as well as protection from zombies. But the nightmare is far from over. The virus is mutating, and the infected are getting smarter-and faster. Then, when a savvy reporter starts asking too many questions, she's murdered. Dave finally uncovers the truth behind the epidemic-a secret medical experiment. But the revelation will cost him, and the price just might be too much to bear. Since the beginning, Dave has fought to protect the ones he loves. What if it's not enough?