The Sly the Sleuth series does not have a new book coming out soon. The latest book, Sly the Sleuth and the Code Mysteries (Book 4), was published in October 2009.
The first book in the Sly the Sleuth series, Sly the Sleuth and the Pet Mysteries, was published in March 2005.
The Sly the Sleuth series primarily falls into the Mystery genre. This chapter book series was written for ages 7-10, but some older readers may still like to read these books.