The Secret of the Old Mill: Adventure & Mystery Novel (The Hardy Boys Series)

Frank and Joe Hardy, aspiring detectives, delve into a case involving counterfeit money that has been troubling their hometown of Bayport. Their friend Chet Morton has fallen victim to a scam, prompting the brothers to investigate. During a picnic near an old watermill, they receive a threatening message warning them to abandon their inquiry, hinting at deeper mysteries connected to the mill. As they uncover clues, the Hardys are determined to unveil the secrets surrounding the suspicious events in their town.