সংক্ষিপ্ত বিবরন : A big part of this book is a description of the geography surrounding the Amazon River and the rest is dedicated to the science of decoding ciphers. Most of Vern’s books have a balance between the plot and science, and facts. Unfortunately, this one fails to achieve that. The main character Joam Garral and his family travels on a giant raft along the Amazon river, from Iquitos to Belém where his daughter would get married to Manuel Valdez in the presence of his invalid mother. During the journey, they go through many adventures and face many dangers. What's more, the father is accused of a crime he never committed, and the only proof of his innocence is an encrypted document. His family and friends must race against time to decode it before the man is executed.