The fourth volume of Girl Genius recounts the first half of Agatha's adventures with Master Payne's Circus of Adventure. Agatha and Krosp crash their airship in the Wastelands and meet the various members of the Circus as a result — most importantly, Agatha meets Zeetha. After a pair of daring rescues, Agatha is taken in as a full-fledged Circus member, who put her on stage as her mother opposite Lars, and deceive a devastated Gilgamesh Wulfenbach and not-so-devastated Bangladesh DuPree. Back on the Castle Wulfenbach, Klaus reveals a surprising backstory twist as he recovers from Agatha's escape. This volume ends with Agatha having an unsettling talk with Othar Tryggvassen after a performance and with Jägers being assigned to follow her and keep her safe.
The past and the present unwind simultaneously in Volume 4 as we discover that the Baron's wariness has reasonable cause and Gil's background may be more exotic than at first glance. Agatha continues to grow, especially with Zeetha's adoption of her in the Skifandrian tradition of Kolee-dok-Zumil. The next part of the story is teased by the hints about the mysterious Moxana — what part will she play in Agatha's journey?
The colors were done by Laurie E. Smith.
The comics in this volume were intended for issues 11, 12, 13, and 14 of the Girl Genius Comic Book, but only the first three were published before Girl Genius became a webcomic.