Reviewed by Harrison M. (age 8)
I think this book was good because I like mysteries and it's a mystery book. My favorite part was when they tricked Oscar Smuff because he was really scared. The illustrations were good to me - they were black and white. This book isn't like another book I've read because it's not like robbery mystery. It's a different kind of mystery. I felt good reading this book because it made me wonder where the jewels were.
I recommend this book to second graders and up because I think it might be a little hard for first graders. I think people who like mysteries would like this book. I think people would be interested in the part where Frank and Joe went into the old tower because there's a lot of adventure in that part.