The last time Alexandra sees her scientist father he tells her to wait two weeks for him to return. If he doesn’t, she and her mother must find her sister, over three hundred miles away, in one of the states under quarantine. A virus is infecting the healthy, turning them into raging, cannibalistic versions of their former selves. Dr. Ramsey has spent months studying the E-TR virus, including Alex in his trials. Before he leaves he hands Alexandra what may be the most valuable information in existence. Information that more than one powerful group would go to great lengths to possess. Alexandra is no match for this world—one where men and women crave the taste of flesh and the weak are a liability, but she made her father a promise. One she intends to keep no matter how many lives are lost on the way.