In 1914, with the well-wishes of the Brazilian government, Theodore Roosevelt, ex-president of the United States; his son, Kermit; and Colonel Rondon travel to South America on a quest to course the River of Doubt. While in Brazil, Theodore is also tasked with a "zoogeographic reconnaissance" of the local wilderness for the archives of the Natural History Museum of New York. In addition to the perils of the incredibly difficult and dangerous terrain,...