Franklin W. Dixon

Light Hardcover (1 lb or less)

Triggered by the disappearance of a brilliant young professor, this mystery takes the Hardy boys first to Kenworthy College, where they find a puzzling message on an examination paper. But then, a new clue is unearthed that sends the young detectives to the Honeycomb Caves. After many dangerous encounters, Frank and Joe discover a powerful searchlight in one of the craggy caverns along the seacoast. In the brilliant white glare of the searchlight, the startling secret of the caves is dramatically revealed.

Hardy Boys 07: the Secret of the Caves

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Mild wear on spine and back cover. See photos. 

Michigan

When the Hardy boys reached the caves, they came unexpectedly upon a queer old hermit.

Category - Fiction / Juvenile Fiction

Format - Hardcover

Condition - Like New

Listed - A month ago

Est. Publication Date - May 1929