Girl Genius Novels book 4. Spoilers for the earlier books/webcomic of the same storyline.
The continued work on the Castle evolves into all out war, with weasels, two dragons fighting, the need for a spark, Moloch's being confused about women, and more.
Again a faithful retelling of the webcomic -- taking advantage of the new medium to express some things that are better suited to words than to comic strip format. For instance, while it was obvious that Snaug would not be a good girlfriend for Moloch, this makes her clearer.
The footnotes are used for backstory as well as the amusing notes. (Some of them mentioned future events that might be regarded as a trifle spoilerish for future stories.)