Girl Genius: Book Nine: Agatha Heterodyne and the Heirs of the Storm – Phil & Kaja Foglio

I can't praise this title enough and urge everyone to read it, starting here. In this volume Agatha continues her attempt to gain control of her ancestor's castle before an impostor does (oh, and before the sentient and insane castle kills her). This is might slightly more difficult with the arrival of her two romantic interests, the son of the mad scientist who rules Europe, Gilgamesh, and Travek who would depose him. The real problem comes up when Travek falls ill with a fatal disease and only Gilgamesh can save him.