In an alternate 1914 Europe, Austrian Prince Alek, on the run from forces who are attempting to take over the globe with machinery, forms an alliance with Deryn, who is learning to fly genetically-engineered beasts.
It is the cusp of World War I. The Austro-Hungarians and Germans have their Clankers, steam-driven iron machines loaded with guns and ammunition. The British Darwinists employ genetically fabricated animals as their weaponry. Their Leviathan is a whale airship, and the most masterful beast in the British fleet. Aleksandar Ferdinand, a Clanker, and Deryn Sharp, a Darwinist, are on opposite sides of the war. But their paths cross in the most unexpected way, taking them both aboard the Leviathan on a fantastical, around-the-world adventure….One that will change both their lives forever.