Girl Genius The Second Journey of Agatha Heterodyne. Kings and wizards. Book four

"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."--Amazon.com