In a valley beneath the purple mountains of primitive New Guinea live a small band of white people. Some are consumed by enormous lusts for power that have led them to flee from Europe and here they can indulge their sick passions. But dark people of the valley are ruled by the throbbing, tribal Kundu drums that for centuries have urged them to frenzied sorcery. The result is an explosion of the terrible violence, echoing round the mountains like the Devil's own thunder let loose.