I believe there is now a 6th book in the series.
My son is on the 3rd of 6 The Titans Curse Percy Jackson and the Olympians I believe. He got the 6 pk from a school book before school let out.
He is also reading Throne of Fire 2nd in the The Kane Chronicles series.
He has also read the Lost Hero and the Son of Neptune from The Heroes of Olympus. The 3rd book from this series is to be out in August.
He loves these books.
To date his favorite has been Inheritance Trilogy by Christopher Paolini, there is now a 4th in the set.
