Adventurer Guy Grieve and primatologist Julie Anderson spend six weeks in the Central African rainforest, trying to save one of the world's rarest monkeys. Their home is an amazing treehouse, high in the canopy, that allows them unique access to the monkey's world and keeps them safe from dangerous forest elephants.

Adventurer Guy Grieve and primatologist Julie Anderson continue their expedition to the rainforest in Gabon, one of the least-explored places on Earth. Guy has a close encounter with an elephant and explores the threats facing these beautiful animals, while Julie begins to understand how to save an endangered monkey from extinction.