In the third installment of the Girl Genius novels, Agatha H. and the Voice of the Castle begins as Agatha Heterodyne returns to her ancestral home, the warped little town of Mechanicsburg. There she must claim her inheritance by convincing the artificial intelligence that animates her family's castle that she is, in fact, the new Heterodyne. But this apparently simple task is made complicated in several ways: An imposter claiming to be the legitimate heir appears.
The Industrial Revolution has escalated into all-out warfare. Sixteen years have passed 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 Heterodynes’ return. At Transylvania Polygnostic University, a pretty, young student named Agatha Clay seems to have nothing but bad luck.
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With the help of Krosp, Emperor of All Cats, Agatha has escaped from the massive airship known as Castle Wulfenbach. After crashing their escape dirigible, Agatha and Krosp fall in with Master Payne’s Circus of Adventure, a traveling troupe of performers dedicated to staging Heterodyne shows - dramatizations of the exploits of Bill and Barry Heterodyne and their allies - who are unaware of Agatha’s connection to the Heterodyne line.
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