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The Secret of the Caves: The Hardy Boys Series, Book 7 audiobook cover

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The Secret of the Caves: The Hardy Boys Series, Book 7

By Franklin W. Dixon

In "The Secret of the Caves," the seventh book of The Hardy Boys series, amateur detectives Frank and Joe Hardy search for a missing college student, which leads them to investigate strange occurrences and a hidden cave along the coast near Bayport.

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