After the son of engineer Bill Markham is abducted by an aboriginal tribe on the edge of the rain forest, the engineer spends the next 10 years searching for him.After the son of engineer Bill Markham is abducted by an aboriginal tribe on the edge of the rain forest, the engineer spends the next 10 years searching for him.After the son of engineer Bill Markham is abducted by an aboriginal tribe on the edge of the rain forest, the engineer spends the next 10 years searching for him.