Once, Gavin Ennock sailed the skies on airships and enchanted listeners with his fiddle music. Now, the clockwork plague consumes his intellect, enabling him to conceive and construct scientific wonders—while driving him quite mad. Distressed by her beloved’s unfortunate condition, Alice Michaels sought a cure rumored to be inside the Doomsday Vault—and brought the wrath of the British Empire down on them.

Declared enemies of the Crown, Alice and Gavin have little choice but to flee to China in search of a cure. Accompanying them is Dr. Clef, a mad genius driven to find the greatest and most destructive force the world has ever seen: The Impossible Cube. If Dr. Clef gets his hands on it, the entire universe will face extinction. 

And Gavin holds the key to its recreation…