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Description
Read by Bill Irwin approx. 3 hours 2 cassettes Determined to learn the secret of the old mill, Frank and Joe employ a clever use to gain entrance and become trapped. There they unravel two mysteries, one involving a counterfeiting case and the other, a national security case their father is... read more
First Sentence
"Wonder what mystery Dad's working on now?" Joe Hardy asked.
Table of Contents
Series
This is book 3 in the Hardy Boys series.
Authors & Contributors
- Franklin W. Dixon (Author)
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