A terrorist detonates a dirty bomb in the heart of a densely-populated city, unleashing a gruesome zombie plague that spreads like wildfire. Sarah's father was bleeding out, and she knew he would die if she didn't get him to a hospital fast. Laying the peddle to the metal, off-duty paramedic Steve races the dying man and his desperate daughter to the hospital, only to be redirected to an evacuation center on the outskirts of town. Rushing in, the trio finds the frantic staff overwhelmed by a staggering number of dead bodies. Just as her father receives a massive dose of adrenaline, Sarah falls unconscious. She's about to drift out of one nightmare and into a waking-terror beyond her wildest fears. Waking up to find the hospital corridors darkened and silent, Sarah soon comes face to face with the living dead, and begins her epic struggle for survival in a strange new world.