Hardy Boys Beginners 1-10 Vol Set: Tower Treasure, House on Cliff, Secret Old Mill, Missing Chums, Hunting Hidden Gold, Shore Road Mystery, Secret of Caves, Mystery Cabin Island, Airport Mystery, What Happened At Midnight

Only the first 10 volumes.. not first editions. many many more books were written over the years. The characters were created by Edward Stratemeyer, the founder of the Stratemeyer Syndicate, a book-packaging firm, and the books have been written by many different ghostwriters over the years. The books are published under the collective pseudonym Franklin W. Dixon.