"From the notebooks of the Unknown Adventurer" -- Front cover.

"Warning. This book describes a perilous adventure into the Amazon rainforest, in which a number of dangerous activities are undertaken. None of these activities should be attempted without the supervision of an adult. The publisher disclaims liability for any injury or damages resulting from engaging in the activites contained in this book."

"Join the Unknown Adventurer again on this thrilling adventure into the Amazon, which begins with a map discovered in the Royal Geographical Society showing a river that has been mysteriously rubbed out. It leads the Unknown Adventurer and his companion Bibi into a search for this 'last river' that will change their understanding of nature forever" -- Amazon.