A call for help. A vanishing professor. And a rugged coastline hiding a sinister secret... When Frank and Joe Hardy set out to help a friend in trouble, they never expect to be swept into a thrilling hunt for a missing man-and a string of mysterious events tied to the desolate Honeycomb Caves. Strange figures lurk near the cliffs, unmarked cars speed through the night, and a hidden wireless tower pulses with secrets no one wants uncovered. Guided by sharp instincts and relentless curiosity, the Hardy boys follow a trail from their quiet hometown of Bayport to the windswept shores of Rockaway, where danger hides behind every crashing wave. With quick wits, steady nerves, and a few daring moves, they must solve a puzzle that stretches far deeper than the caves themselves. Timeless and packed with classic suspense, this original Hardy Boys adventure delivers twists, thrills, and edge-of-your-seat excitement.