Determined to experience the mighty Amazon for himself, Dennison Berwick travelled alone for more than year in a small canoe along major rivers and unnamed tributaries. At night he slung a hammock between trees in the forest, surrounded by all the noises of creatures active in the darkness. He walked for a week to reach the source of the Amazon in the snow-capped Andes in Peru; got lost in the forest; took hallucinogenic ayahuasca and ended his adventure...