There are 3 books in the Adventures of Arabella Ashby series.
The Adventures of Arabella Ashby series does not have a new book coming out soon. The latest book, Arabella the Traitor of Mars (Book 3), was published in August 2018.
The first book in the Adventures of Arabella Ashby series, Arabella of Mars, was published in July 2016.
The Adventures of Arabella Ashby series primarily falls into the Alternative History, Steampunk, Historical, Science Fiction and Fantasy genres.