This paperback version is books 2 & 3 of the Apocalypse Infection Unleashed Series. You get two books for the price of one. The Zombie Chronicles - Book 2 - Dean and Nick will stop at nothing to save their sister, Val, who was bitten by a zombie. When their helicopter crashes into the middle of Zombie Land, the three siblings must fight to survive. Things suddenly get more complicated when a drifter steals the precious vials needed to save Val. The hunt is on to find the scoundrel and get their vials back. The Zombie Chronicles - Book 3 - When Nick and Dean chase Tahoe into a city where he's taken refuge, they learn that this city is more bizarre and mysterious than they ever thought before. Ignoring their instinct to leave, they put on a brave front and continue their search for Val who has turned into a zombie...and is out on the loose. Dean feels they're closer than ever to getting the vials back, but when he learns about a deadly secret the city hides, his mission turns into a life and death struggle...literally.