An intrepid adventurer, Mark has spent the last decade traveling areas left ominously blank on maps. This is the story of his malaria-wracked expedition across central Borneo. Once again he defies cartographers by going in search of the 'wild men of Borneo'-a tribe of jungle dwellers whose existence is validated only by myth. With fellow traveler Paul he paddles up an uncharted river into what was believed to be the valley of the spirit world-where even the island's fiercest head hunters fear to go. Crossing treacherous mountains that no Western eye has ever seen, they penetrate ever deeper into the inhospitable jungle. On the way they encounter shipwrecks, malaria, amoebic dysentery, near-starvation, leeches, exhaustion, enforced alcohol abuse, a barbecued mouse-deer foetus and a ferocious craving for chocolate.