The Second Journey of Agatha Heterodyne is the full, official title of the second, and possibly final, set of volumes in the story of Agatha Heterodyne, which has the blanket title Girl Genius. This part of the story was originally called Act 2 and is still referred to this way as a much shorter nickname by both fans and the Foglios. This set of volumes starts at the overall volume number 14, but is identified on the book cover and in catalogs and most other references by the Foglios as the first volume of The Second Journey of Agatha Heterodyne or Act 2; it includes three completed volumes and a fourth volume currently being serialized on the Girl Genius website so far.