Mirra Mantle knows there is something better in the world than what she sees. She and her twin brother, Burrow, battle to survive in a harsh dystopian existence. Like many teens they deal with the everyday pressures of school and work, a widowed parent, and relationships. In their lives, however, work is forced hard labor, education is painful indoctrination, their father is a sacrificial addict, and their mother may have been murdered. There is also a little problem with a zombie plague that has destroyed most of their world. The Mantles are part of the Freerunners, a group of eclectic,...