Sent to devote the summer with their uncle onto a remote island, young brothers Andy and Mark learn that their eccentric grandfather once owned the island, but vanished with no hint...carrying with him the trick to a huge fortune. Delving into this island's mysterious past, the brothers realize that their grandfather designed a treasure hunt, a hunt that heal their family -- when they will find it in time and could lead to wealth. Sinister forces search for the money and will stop at nothing to preserve the boys. The boys learn that some family secrets can't stay buried, and that the bonds of family will be the most effective wealth of all as the adventure unfolds.