River Rats (The Hardy Boys)

River Rats is the 61st title in the original Hardy Boys mystery series published by Grosset & Dunlap. It was first published in 1979.

In River Rats, Frank and Joe Hardy investigate the theft of valuable plans for an experimental airplane and a series of attacks on riverboats along the Barmet River. The main suspects are a group of local troublemakers known as the "River Rats." The Hardys must infiltrate the River Rats' gang to uncover the truth and stop the criminals before they can do more damage or steal further secrets. The mystery involves elements of environmental sabotage and corporate espionage, leading the Hardy Boys on a chase through the Barmet River's waterways and into confrontations with dangerous individuals.