Descenders will be the 13th book in the Edge Chronicles series and the 3rd book in the Cade Saga. It will be published 2017/18. According to Chris Riddell on Periscope, this will be the last book of the Edge Chronicles.
|Books in the Edge Chronicles series, by Paul Stewart and Chris Riddell|
Nate Book: The Immortals
Blogs: Weird New Worlds