Read Series: Girl Genius

Book

Girl Genius, Vol. 5: Agatha Heterodyne and the Clockwork Princess (2009)

Agatha Heterodyne is the last heir to the Maddest of Mad Scientist families, and on the run from the current ruler of Europe. In a fairy-tale castle on a mountain pass, she finds herself at the center of an evil plan to bring back one of the deadliest enemies of recent history.