"Roosevelt has been able to add one more excellent volume to a list which is already a praiseworthy record." — The New York Times

"An exceedingly fascinating story of adventure. It is the best story ... that the many-sided former president of the United States has produced." — The Boston Transcript

Here is the tale of the famed conservationist and outdoorsman's last great adventure, recounted in his own words. In a narrative that crackles with energy and enthusiasm, Theodore Roosevelt tells of the challenges and perils he and his companions faced during a 1913–14 expedition to a remote area of the Brazilian Amazon basin. Roosevelt, his son Kermit, and their crew set out to chart the nearly 1,000-mile long "River of Doubt," in addition to collecting thousands of plant and animal specimens.

Written with the expertise and zest of a seasoned naturalist, Roosevelt's account combines the thrill of scientific exploration with the suspense of harrowing dangers. Stalked by cannibals and menaced by wild animals, the crew was in constant jeopardy of drowning in the turbulent rapids. Overwhelming heat, food shortages, and a plague of insects hampered their progress, in addition to Roosevelt's affliction with a life-threatening tropical fever. This real-life drama of courage and discovery will captivate historians and Roosevelt fans as well as modern-day explorers and lovers of adventure.