In 1913, former President Theodore Roosevelt embarked on a perilous expedition to explore one of the last unmapped rivers in the Amazon. Roosevelt was joined by his son Kermit, famed Brazilian explorer Candido Rondon, and a team of naturalists and porters. But as the party sets off on a 400 mile trek across the highlands to reach the headwaters, they discover they are woefully unprepared for the dangers that await them in the wild.

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