NEW YORK TIMES BESTSELLER - The harrowing story of one of the great feats of exploration of all time and its complicated legacy--from the New York Times bestselling author of The River of Doubt and Destiny of the Republic "A lean, fast-paced account of the almost absurdly dangerous quest by [Richard Burton and John Speke] to solve the geographic riddle of their era." --The New York Times Book ReviewFor millennia the location of the Nile River's headwaters...