I know this thread was from forever ago...but I bought the first and second book in this series and was planning to give it to my DS who is turning 6 on his birthday coming up. I guess I am not sure if 6 is too young. He reads all sorts of stuff, currently hugo Cabret for the second time. He is a PG kid and I think some of the themes would be neat for him. Plus he LOVES puzzles and all that stuff. Anyone else have kids that young who have read it and enjoyed them?