Girl Genius Volume Seven - Agatha Heterodyne and the Voice of the Castle.
In a time when the Industrial Revolution has become an all-out war, Mad Science rules the World…with mixed success.
Until recently, Agatha Clay was a student at Transylvania Polygnostic University. But that was before she was discovered to be the lost heir to the famous Heterodyne Family. Now she must find a way into the bizarre mechanical fortress that is her family's castle, before a charismatic imposter takes her place!