It is 10 years after the events of Treasure Island and Jim Hawkins return home from the University of Oxford. Long John Silver also visits the Admiral Benbow Inn. He has his mind set on Flint's map because he knows the old pirate's diamonds are still on the island.
Jim Hawkins has been assigned to Squire Trelawney's plantation in Jamaica so he and his servant Ben Gunn set sail aboard the Saracen for the colonies. Amongst the prisoners in the ships hold is Long John Silver, who soon works his way up to ship's cook.
After surviving a mutiny on the Saracen, Hawkins, Silver, Gunn and several others find themselves on the mysterious island of Santa Anna. Apparently, in the past, only lunatics and undesirables were marooned by the Spaniards there.
Having finally arrived at his post in Jamaica, Jim Hawkins soon finds the bookkeeping at Trelawney's plantation to be out of order. He befriends a young slave named Abed but makes an enemy out of plantation manager Joshua Hallows.