When Milo accidentally intercepts a coded message meant for the Sky Raider air gang in the ruined city of Crest, he quickly figures out what it says: a Shadow Hawk spy is hunting him, and they don’t mean well. Gadget Zodiac, mechanic for the Raiders, promises to help him figure out who the spy is. But she might not be as trustworthy as she wants him to think, and the Raiders will execute whoever turns out to be the spy. If Milo guesses wrong, his life isn’t the only one on the line.