Rachel thinks that she and her mother are safe working for Ms. Moore at her estate close to The Line, an invisible border of the Unified States, but when Rachel has an opportunity to Cross into the forbidden zone, she is both frightened and intrigued.
A group of children, stranded at an amusement park following a biological terrorist attack that has killed all the adults on Earth, work together to survive with the help of Milo, a boy whose father was an engineer at the park, but when new threats arise and suspicions grow, rebellion erupts.
Consigned to a prison-like Youth Training Facility because of her parents' political activities, Marena organizes a resistance movement to combat the restrictive policies of the ruling Zero Tolerance party.
After the death of his father, ten-year-old Moon Blake is removed from the Alabama forest where he was raised and sent to a boy's home, where, for the first time, he has contact with the outside world and learns about friendship, love, and humanity.
