Hardy Boys #7: The Secret of the Caves

Author: Dixon, Franklin W.

Age Range: 8 - 12

Grade Level: 3 - 7

Hardcover: 180 pages

Publisher: Grosset & Dunlap

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.