In the jungles of the Underland, scattered remnants of an ancient culture speak of a great evil that dwells in the shadowy depths of the Kwayerumoshi caves. But even the darkest secrets of this lost age are about to be revealed by the brave actions of three unlikely heroes.

In the final chapter of The Journey Down, Bwana, Kito and Lina explore the vast reaches of the Underland and unravel its long-forgotten history. Their adventure comes to a bombastic conclusion when they learn the true nature of the Great Asili tree and the Armando Power Company.