The Secret of the Old Mill (Hardy Boys Mystery Stories Series #3)
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!
Frank and Joe unravel two mysteries, one involving a counterfeiting case and the other concerned with a national security case their father is working on.
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