Martin may have seen his sister, Cassie, to safety at the end of The Sky Inside, but his adventure is far from over. There’s still a totalitarian regime in place, murderous game shows on the air, and a couple of government agents on Martin’s tail. When Martin and his AllDog, Chip, go back to his old suburbs to check up on Mom, they get a lot more than they bargained for when they end up escaping with both parents. But the biggest surprise is yet to come-the heart of the government’s central power is closer to Martin than he ever suspected.