First published in 1927, now public domain in the USA and Canada, The Secret of the Old Mill is the third book in the Hardy Boys series. With two cases in tow, the Hardy boys look to Turner mill for clues. Determined to learn the secret of the old mill, Frank and Joe employ a clever ruse to gain entrance, only to find themselves trapped. How the young detectives extricate themselves from this dangerous situation and unravel mysteries will keep readers tense with suspense!

ISBN: 9780448089034