Reviewed by Tyler R. (age 8)
I liked this book because of the action in it. My favorite part was when Frank and Joe find out where the secret cave was. It was really cool. Joe and Frank were my favorite characters because they are good detectives and they make the story interesting. This book is part of the Hardy Boys series. It is the first Hardy Boys book I read but it made me want to read more.
I would recommend this book to kids age seven and up. I would recommend this book because it is really cool and it has a lot of action. I think boys and maybe girls would like it. The part they would probably like best is where Joe and Frank blow down the door. That part has a lot of action and excitement.