Sharks, shipwreck, and sunken treasure in the latest adventure trilogy from Gordon Korman.Four kids are on a marine expedition for the summer, diving to explore an underwater habitat that's just been altered by a seismic event. What they find, though, is much more than fish - it's sunken treasure. Can they salvage it without anyone else getting to it first? Will the prospect of wealth set them against one another? And what about those sharks...

The most popular pirate story ever written in English, featuring one of literature's most beloved “bad guys,” Treasure Island has been happily devoured by several generations of boys-and girls-and grownups. Its unforgettable characters include: young Jim Hawkins, who finds himself owner of a map to Treasure Island, where the fabled pirate booty is buried; honest Captain Smollett, heroic Dr. Livesey, and the good-hearted but obtuse Squire Trelawney,...