"Alek is a prince without a throne. On the run from his own people, he has only a fighting machine and a small band of men. Deryn is a girl disguised as a guy in the British Air Service. She must fight for her cause-and protect her secret-at all costs. Alek and Deryn are thrown together aboard the mighty airship Leviathan. Though fighting side by side, their worlds are far apart. British fabricated beasts versus German steam-powered war machines. They are enemies with everything to lose, yet somehow destined to be together."