Sam Cooper lives right near the ocean, on the Treasure Coast of Florida. All he's heard about since he moved here are the fabulous treasures that have been found, and those still waiting to be discovered. Sam, Tony, and Tyler, are convinced that they will be the ones to dig up the next great find. They meet a crusty sea captain named Jack who's fixing up an impossible looking old tub. What is Captain Jack's mysterious secret? And what is he really planning to do with that boat?