Title: The secret of the old mill
Description: Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.
Subjects: Counterfeits and counterfeiting, Detective and mystery stories, Fiction, Mystery and detective stories, Hardy Boys (Fictitious characters), Mystery, Juvenile Fiction, Children's fiction, Hardy boys (fictitious characters), fiction, series:HardyBoys, collectionID:HBMS1, Fiction, action & adventure, Fiction, general, Reference books, Fiction, mystery & detective, general, Fiction, horror, Brothers -- Juvenile fiction, Counterfeits and counterfeiting -- Juvenile fiction, Hardy Boys (Fictitious characters) -- Juvenile fiction, Adventure, Children’s, Joe Hardy (Fictitious character), Frank Hardy (Fictitious character), Juvenile literature