The Industrial Revolution has escalated into all-out warfare. It has been sixteen years since the Heterodyne Boys, benevolent adventurers and inventors, disappeared under mysterious circumstances. Today, Europe is ruled by the Sparks, dynasties of mad scientists ruling over - and terrorizing - the hapless population with their bizarre inventions and unchecked power, while the downtrodden dream of the Hetrodynes' return. At Transylvania Polygnostic University, a pretty, young student named Agatha Clay seems to have nothing but bad luck. Incapable of building anything that actually works, but dedicated to her studies, Agatha seems destined for a lackluster career as a minor lab assistant. But when the University is overthrown by the ruthless tyrant Baron Klaus Wulfenbach, Agatha finds herself a prisoner aboard his massive airship Castle Wulfenbach - and it begins to look like she might carry a spark of Mad Science after all. From Phil and Kaja Foglio, creators of the Hugo, Eagle, and Eisner Award-nominated webcomic Girl Genius, comes Agatha H and the Airship City, a gaslamp fantasy filled to bursting with Adventure! Romance! and Mad Science!