TWO OPPOSING FORCES ON THE BRINK OF WAR
The Clankers, who put their faith in machinery, are squaring up to the Darwinists, who have begun evolving living creatures into tools.
Prince Aleksandar, the would-be heir to the Austro-Hungarian throne, comes from a family of Clankers, and travels the country in a walker, a heavily-fortified tank on legs.
Deryn Sharp, a girl disguised as a boy, works for the British Empire, crewing an airship made of living animals- the ultimate flying machine.
Now, as Alek runs from his own people, and Deryn crash-lands in enemy territory, their lives are about to collide...