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"In a time when the Industrial Revolution has become an all-out war, Mad Science rules the world ... with mixed success."--Page 4 of cover.

Agatha Heterodyne returns to her ancestral home, the warped little town of Mechanicsburg, to convince the artificial intelligence that animates her family's castle that she is, in fact, the new Heterodyne. But things get complicated when an imposter claiming to be the legitimate heir appears.

In a fairy-tale castle, Agatha Heterodyne confronts a deadly enemy intent on destroying her mind. The Wulfenbachs learn of her survival and rush to rescue her, but complications arise as Agatha is possessed by the evil mastermind behind the Long War.

Adventure, Romance, Mad Science! Heroes and villains fight for control of Mechanicsburg, as Agatha finally repairs the damaged machine that is Castle Heterodyne.

After escaping from the massive airship known as Castle Wulfenbach, Agatha falls in with a travelling troupe of performers, where she begins training under Zeetha, swordmistress and princess of the lost city of Skifander. With Wulfenbach on her trail, it's going to take more than a spark of Mad Science for Agatha to traverse the treacherous wasteland of war-torn Europa.

Deep in the heart of the damaged machine that is Castle Heterodyne, Agatha discovers her mother's long-abandoned secret laboratory. But waiting inside is a relentless guardian that is not what it seems!

The Industrial Revolution has escalated into all-out warfare and Europe is ruled by dynasties of mad scientists, terrorizing the population with their bizarre inventions. At Transylvania Polygnostic University, student Agatha Clay seems destined for a boring career as a lab assistant, until the University is overthrown by a ruthless tyrant, and Agatha finds herself a prisoner aboard his massive airship

An alien task force searching for test subjects for their experiments meets their match in a tough New York City street gang