Since it doesn't take me long to read these books, I decided to wait until a few more came out and catch-up on them. I read 6, 7, and 8 and there are only two more left! The 9th is actually out and I have a hold on it at the library, but there's a long line, so I'll probably have to wait. These books continue to be what they started out as... fun, adventurous, mysterious... but not spectacular. The plot does continue to thicken, but I'm ready to know how it ends and move on. I think these books are great for kids, though (both boys and girls, which is nice), and I definitely recommend them to people who are looking for books for their kids (ages 8 or so on up, depending on the maturity of the kid - there are some scary/intense moments).