The fifteenth volume of Girl Genius begins with…
The colors were done by Cheyenne Wright.
The first page of volume 2 of act 2 begins here: The Second Journey of Agatha Heterodyne and the fifteenth volume overall.. While this volume is often referred to as the second volume of act 2 for short, it is officially the second book of
This volume has four pages of extras, providing a fairly extensive cast list with capsule descriptions of the characters along with definitions of some terms used in the story, at the beginning of the book.
Presumably, a cast list has been included in this volume, although one wasn't present in volumes in the First Journey, because books in the Second Journey are supposed to be a good starting point for new readers. The previous volumes (The First Journey of Agatha Heterodyne, books 1–13) did each include a summary of "The Story So Far" and a humorous capsule biography of the professors, which this volume omits.