Trio and her friends have escaped the remains of Los Angeles and the horrible Crawlers intent on her capture, finally on their way to New York. But the train they ride offers more threats than comfort, both from the uncertain track stretching out before them to the infighting and open dislike from train boss Chime and her crew. Trio has no choice, her heart and soul pushing her across the country, toward a task she can't remember and a damaged clone who will call her sister.