During a thunderstorm, twelve-year-old Joseph Martin is thrown from his horse and trapped in an ancient mine with supernatural secrets. Transported through time, his world changes to adventure back in the days of pirates and treasure. Held captive by the evil Captain Titus aboard the Josephine, he sails to "The Island of Eternal Life" inhabited by bloodthirsty cannibals. Joseph learns the magical secret of the island and must choose to ultimately fight for good or evil.