There are 3 books in the Journal of a Cardboard Genius series.
The Journal of a Cardboard Genius series does not have a new book coming out soon. The latest book, Time Twister (Book 3), was published in March 2008.
The first book in the Journal of a Cardboard Genius series, Star Jumper, was published in March 2006.
The Journal of a Cardboard Genius series primarily falls into the General Fiction genre. This chapter book series was written for ages 7-10, but some older readers may still like to read these books.