Girl Genius: The Second Journey of Agatha Heterodyne Volume 2: City of Lightning

Adventure, Romance, Mad Science! Agatha is the last of the Heterodynes, a notorious family of Mad Scientists that everyone had thought safely wiped out. When a rival scientist traps her family castle and the surrounding town in a time-freeze, Agatha must embark on a journey to find a way to reverse the effect and save the people she loves.