This was a great quick mystery and the start of a fun series. It's a mixture of The Westing Game and the movie National Treasure. These kids are given a clue in The Game and need to find the other 38 clues to find an unknown prize. This is only the first book, but I'm intrigued enough to read on! Rick Riordan wrote this book, but I guess that other authors will also be writing. Should be fun!