The Lure of Buried Treasure

A man in the Seychelles Islands (Indian Ocean) is obsessed with finding a treasure buried by a French Pirate.

I can't recall a pirate hoard ever being found before. They've found a couple of pirate shipwrecks with some treasure still aboard, but no buried hoards. Most pirates spent it as fast as they got it, and the few who were known to have buried treasure, such as Kidd, recovered it fairly quickly. Still, ever since Robert Louis Stevenson wrote Treasure Island, men have hoped.