The new journey begins when young adventurer Sean receives a coded distress signal from a mysterious island where no island should exist-a place of strange life forms, mountains of gold, deadly volcanoes, and more than one astonishing secret. Unable to stop him from going, Sean's new stepfather joins the quest. Together with a helicopter pilot and his beautiful, strong-willed daughter, they set out to find the island, rescue its lone inhabitant and escape before seismic shockwaves force the island under the sea and bury its treasures forever.