When teenage twins James and Jerome are told that treasure, buried during the days of slavery, is their rightful inheritance, their summer holidays turn into a frantic treasure hunt. Determined to find Abraham's Treasure, they de-code the clues that take them to the mystical interior of their Caribbean island home. On the way to a terrifying resolution, they meet a helpful parrot, a ghostly figure from the past and a legless man who can walk; they escape from a falling tower and discover a boiling lake. Close behind them, however, is their enemy, an evil stranger, who also has claims on the treasure.