The Thisby Thestoop series does not have a new book coming out soon. The latest book, Thisby Thestoop and the Wretched Scrattle (Book 2), was published in January 2019.
The first book in the Thisby Thestoop series, Thisby Thestoop and the Black Mountain, was published in April 2018.
The Thisby Thestoop series primarily falls into the Fantasy genre.