Seventeen-year-old Kress makes ends meet by fighting monsters, but her debts keep piling up until she is finally forced to make a deal and join a desperate rescue mission.

"Brought to the flying city of Highgate when he was only five years old, orphan Milo Quick has never known another home. Now almost thirteen, Milo survives one daredevil grift at a time, relying only on his wit, speed, and best friends Jules and Dagda. Amassive armada has surrounded Highgate's crumbling armaments. Because behind locked doors--in opulent parlors and pneumatic forests and a master toymaker's workshop--the once-great flying city protects...