There are 6 books in the League of Griefers series.
The League of Griefers series does not have a new book coming out soon. The latest book, The Hardcore War (Book 6), was published in October 2015.
The first book in the League of Griefers series, The Secret Treasure, was published in May 2015.
The League of Griefers series primarily falls into the Action Adventure genre. This chapter book series was written for ages 7-10, but some older readers may still like to read these books.