The Secret of the Caves by Franklin W. Dixon

https://thebookvoice.com/podcasts/2/audible/74560 to listen full audiobooks. Title: The Secret of the Caves Series: The Hardy Boys Series, Book 7 Author: Franklin W. Dixon Narrator: Hayden Bishop Format: mp3 Length: 4 hrs and 6 mins Release date: 07-08-25 Ratings: Not rated yet Genres: Growing Up & Facts of Life Publisher's Summary: When the Hardy boys set out to investigate the strange disappearance of a college professor, the trail leads them to Honeycomb Caves—a labyrinth of danger and intrigue hidden along the coast. As Frank and Joe dig deeper, they uncover a web of mystery involving secret radio signals, suspicious strangers, and a threat that could shake national security.