Hardy Boys Books 1-10 Box Set - The Hardy Boys Mystery Stories Collection (Hardcover). Join the Hardy Boys for mystery-solving action in this exclusive boxed set of the first ten books in this classic series! Join the adventure and read the stories that started it all. This collectible set is a great gift for aspiring detectives or longtime fans of the series. Recommended Ages: 9 - 12 Format: Hardcover Titles: The Tower Treasure The House on the Cliff The Secret of the Old Mill The Missing Chums Hunting for Hidden Gold The Shore Road Mystery The Secret of the Caves The Mystery of Cabin Island The Great Airport Mystery What Happened At Midnight