The Castle Cant series does not have a new book coming out soon. The latest book, Escape from Castle Cant (Book 2), was published in September 2006.
The first book in the Castle Cant series, The Secret of Castle Cant, was published in September 2004.
The Castle Cant series primarily falls into the Fantasy genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.