The 39 Clues Book 1: The Maze of Bones

It's like Da Vinci Code for kids, without the blasphemy. I wasn't expecting much but Maze of Bones is a fun read. The main characters have a pretty typical sibling relationship, which works since the main focus is the puzzle solving. They have a lot of clue-chasing rivals and I had a little trouble keeping track of them all.

I'm a little concerned at how long this series is going to be. This book only gets through the first clue. If this becomes a 39-book series, I'm out.