This book is another exciting adventure of the boys Hardy. The Hardy Boys (Frank and Joe) want to follow in the footsteps of their father. In this mystery, Mr. Prito the father of Tony Prito is building a bridge in Kentucky. Unfortunately, the bridge is continuously being sabotaged. So, in order to do Mr. Prito a favor Frank, Joe, Chet, Tony, Biff, and Phil are going undercover to figure out who is sabotaging the build. Unfortunately, the boys experience difficulties along the way. In the end, the boys solve the mystery with the help of two kids.
I got this book for my birthday from my grandfather. My grandfather and father loved these books so I decided to read one. Then I read another and another and so on. I loved this series I couldn't stop reading the books. I love this series so much it's my favorite genre. A mix of action and mystery is a dynamic duo. I give this book a 5 star because I loved how it had more than one perspective it involved all the boys. I personally recommend this book for ages 9 and up. ( )