A failed businessman, heavily in debt finds a wallet which contains a map which he later finds could lead him to hidden treasure. He decides to search for the treasure alone, but Roland Blood, a dealer in naval antiquities, is not far behind. Croft follows the clues on the map from a castle to a church to a seaside promontory and finds the spot where the treasure was buried is the site of a new beach-side housing development. He tries to buy the house, but his bank manager does not look kindly on his proposal and his wife is about to discover that he re-mortgaged her home. He decides to take drastic action.