The Secret of the Old Mill The Hardy Boys Book 3

Frank and Joe Hardy investigate a counterfeiting operation centered around an abandoned mill. When a friend's father is accused of passing counterfeit bills, the brothers take on the case to clear his name. Their search leads them to the mysterious old mill, where they uncover a dangerous criminal ring. With clever detective work and quick thinking, the Hardys expose the counterfeiters and recover stolen money, proving their friend's father innocent. This classic mystery combines suspense, adventure, and the brothers' growing reputation as skilled young detectives.