The Secret of the Caves by Franklin W. Dixon

https://thebookvoice.com/podcasts/2/audible/13420 to listen full audiobooks. Title: The Secret of the Caves Series: The Hardy Boys Series, Book 7 Author: Franklin W. Dixon Narrator: Wayne Evans Format: mp3 Length: 4 hrs and 10 mins Release date: 09-03-24 Ratings: 5 out of 5 stars, 2 ratings Genres: Mystery & Suspense Publisher's Summary: While enjoying a summer day boating on Barmet Bay, Frank and Joe end up saving Mary Todd from downing. She was on her way to see their father, Fenton Hardy about the mysterious disappearance of her brother. While Fenton Hardy went to search for him, Frank and Joe discovered a few small details about the missing professor. Fenton Hardy returned after his unsuccessful search as the boys were heading to a camping trip with Chet and Biff to Honeycomb Caves.