Several years ago one of these books was on my son's summer reading list. (5th grade I think) He loved it so much we had to buy the entire series. He was also quite upset that the school district had chosen the 2nd book in the series instead of the first so his essay when he returned to school focused on that and the fact that the district's listing didn't tell him that there were more--fortunately our local bookstore ordered the entire series when the book was put on the list. He's re-read them several times.