Bayport Elementary is hosting a Mud Run to celebrate spring! A particularly muddy part of the town's park will be set aside for the race and Coach Lambert has even managed to make more mud by using the park's hoses and shovels. Frank and Joe can't wait to splash through the muck.

But on the day of the race, the runners are stopped in their tracks by croaking, blurping bullfrogs! Lots of people in the town had been annoyed that the park was being taken over by a bunch of muddy kids. Could someone have sabotaged the race with buckets of frogs?

This is volume 9 in Hardy Boys Clue Books .

This book has been graded for interest at 6-9 years.

There are 96 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2019 by Simon & Schuster .

Franklin W. Dixon is the author of the ever-popular Hardy Boys books. Santy Gutierrez resides in the seaside city of La Coruna, Spain. He has won acclaim as the Best Spanish Young Editorial Cartoonist and Best Galician Caricaturist, among others.