Tavara Tinker leads a double life. By day, a proper Victorian lady. By night, deep in the heart of industrial London, she maintains a research laboratory and a steam-powered factory where she creates the clothes and weapons for a new generation of adventurer.

Faced with a threat half a world away, Tavara finds herself confronting an adversary that has even gotten the attention of Queen Victoria. Tavara must race against the black airship to save the lives of countless innocent people, and Johnathan as well.