There are 3 books in the Undersea Mystery Club series.
The Undersea Mystery Club series does not have a new book coming out soon. The latest book, The Puzzling Paintings (Book 3), was published in October 2020.
The first book in the Undersea Mystery Club series, Problem at the Playground, was published in September 2019.
The Undersea Mystery Club series primarily falls into the General Fiction genre.