Frank and Joe are headed out on a Kentucky spelunking expedition - exploring caves, that is. But Joe stumbles onto an uncharted subcavern, and suddenly the entire expedition is under attack. Can the Hardy Boys unearth the deadly secret at the bottom of this chasm of danger?
This is Book 115 in the Hardy Boys Casefiles S. Series. See all Hardy Boys Casefiles S. books here.
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Franklin W. Dixon is the author of the ever-popular Hardy Boys books.
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