In a time when the Industrial Revolution has become all-out war, Mad Science rules the world, with mixed success. At Transylvania Polygnostic University, Agatha Clay was a student with trouble concentrating and rotten luck. Dedicated to her studies but unable to build anything that actually worked, she seemed destined for a lackluster career as a minor lab assistant. But then the University was overthrown, and Agatha was taken aboard the giant airship...

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...