The Secret of the Old Mill

More about the book

Set in the small town of Bayport, this mystery follows brothers Joe and Frank Hardy as they investigate counterfeit money that has surfaced after a friend receives fake bills. Despite receiving anonymous threats to abandon their inquiry, the determined siblings delve deeper, leading them to an abandoned mill where they uncover a secret passage and the truth behind the counterfeit scheme. This thrilling adventure showcases the brothers' resourcefulness and courage, making it a standout in the beloved series.