Match wits with the amateur sleuths of the teen mystery series The Hardy Boys! Readers of all ages will enjoy the classic first book from 1927, The Tower Treasure. Brothers Frank and Joe Hardy investigate the murmurs of a dying man who claims to have ?secreted? his loot in the dilapidated towers of a mansion. Written by a group of ghostwriters under the name Franklin W. Dixon, the popular series has sold more than seventy million copies.