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Leviathan by Scott Westerfield

Prince Aleksander, the would-be heir to the Austro-Hungarian throne, is on the run. His country’s own people have betrayed him. His title is worthless. All he has left is a battletorn war machine and a loyal crew of men.

Deryn Sharp is a commoner, disguised as a boy to be in the British Air Forces. She is brilliant airman, but her secret is constantly on the verge of being discovered.

In the midst of World War I, Alek and Deryn’s path will cross in an unexpected way, taking them on a fantastical around-the-world adventure that will change them both.

For those true fans of Scott Westerfield’s books, this series is one of the best series out there. Literally all the books in this series are so good.