In an England overrun by cannibalistic "crazies" and foreign enemies poised to invade, Rex—an impoverished aristocrat—becomes an unwitting hero when he''''s entrusted with a secret document purported to be both a cure and a ticket out of the country. Fleeing the tyrannical rule of London''''s fortress-like remains, Rex races across the infected landscape. He''''s pursued relentlessly by government agents and accompanied by Apryl, a mysterious scientist with her own agenda. As they uncover shocking truths and face brutal choices, their journey becomes a test of love, duty, and survival against overwhelming odds.