An ancient map, a bewildering riddle, a pirate's lingering curse -- you've come to the tropical island of St. Theresa in search of a forgotten fortune, and you've found more than you were looking for. Now your uncle and your cousin have disappeared on a nearby island, and your only recourse is a crusty old sailor called Captain Duval. He alone knows the ins and outs of the local reef well enough to get you where you need to go. But you have second thoughts as he tells you to fork over $100 in traveler's checks for a boat. It's almost all you've got. You look into his leathery face and remember what the woman at the library told you: "He's a thief, but a thief with a good heart."