I loved reading this book because of its diversity. You get a well rounded history from multiple accounts of the many cursed expeditions into the Amazon. The crazy men who dared to do it (both present and past), violent tribal peoples (though you understand why they're so hostile to foreigners), the nearly impassable Amazon terrain, the odd and bizarre creatures that reside their, and in the end, a plausible archaeologically based theory behind why people thought there was a large rich city once in the Amazon. Like all things, people's imaginations run wild, but the author also brings you back down the earth with the reality of the jungle which left me with the overall conclusion that these grandiose theories of a Lost City of Z were really just grand exaggerations of much more practical evidence of a fairly developed, but long lost, past civilization.
Some people criticize the book for only getting to the final expedition at the very end of the book. But I believe this criticism is unwarranted. You can't just jump into the final expedition without getting the backstory and context of the people, place, and time. I feel the author did a marvelous job of jumping around and pacing the book, so that when you get to the final expedition, you're well versed in the context and prepared to understand why things went down the way they did.
Fantastic read, and I shall keep this book as a permanent fixture in my collection. Too bad I only got it in paperback... dang.