"Tom Swift and His Undersea Search; Or, the Treasure on the Floor of the Atlantic" by Victor Appleton is Volume 23 in the original Tom Swift novel series. When a mysterious Mr. Hardley offers Tom a fortune to recover sunken gold from a revolutionary ship, the young inventor eagerly agrees. But Tom soon discovers his partner is a notorious con-artist who has swindled the family of his sweetheart's relative. Now Tom must decide whether to abandon the expedition or dive deep to recover both treasure and honor. (This is an automatically generated summary.)