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!

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!

Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.

The Hardy Boys series, first published in 1927, has sold more than 70 million copies! Now with a brand-new look, this is an edition that collectors won't want to miss! In The Secret of the Old Mill, the third book in the incredibly popular, long-running series, Frank and Joe Hardy are on the case to bust a counterfeit money ring. A special treat for Hardy Boys fans and any reader who's new to the series.

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In the third installment of The Hardy Boys series, brothers Frank and Joe Hardy gain entrance to an old mill but find themselves trapped in an underground tunnel as they try to unravel two mysterious cases.

While driving a motorboat around the Twin Lakes, Nancy and her friend Helen get caught in a dangerous storm. Luckily, they are rescued by another teenage girl in a rowboat. They soon learn that their rescuer is Laura Pendleton, whose mother has recently having passed away. Laura has come to meet up with her new guardians, but something isn't quite right about them. Nancy investigates the situation, and soon she stumbles upon a shocking surprise in the cellar of a bungalow!

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The original 1927 text, before the late 1927 revision. Includes The Secret of the Old Mill section of Hardy and Hardy Investigations.