In 1978 Robin Hanbury-Tenison and a team of scientists went to study the Gunung Mulu National Park in North Borneo - one of the most remote and untouched regions of tropical rainforest left in the world. They found a dramatic landscape of virgin forest, lush hidden valleys and a spectacular network of caves, as well as a rich variety of exotic species of plants and animals and the Penan people, the nomadic inhabitants of Mulu. But this, one of the most valuable regions of national beauty left in the world, would soon become yet another victim of man's exploitation of his planet. Now, a quarter of a century on, the destruction of the Mulu National Park has prompted the reissue of Hanbury-Tenison's book, including an impassioned afterwork by the author.