Using hi-tech climbing technology and a hot-air balloon, Charlotte explores the soaring canopy of the Borneo rainforest - a green landscape hundreds of feet off the ground filled with all kinds of animal life. She also takes a boat into the flooded forest floor of the Amazon, where fish and dolphins swim between the trees. Finally, she delves into the dense underworld of the Congo at ground level - dark, damp and full of dangerous animals. This is her account of her journey, and through her words and research we are given a day-to-day glimpse of a fascinating world, from the largest primates to the tiniest insects.