Using letters, diaries, and firsthand accounts, Ornig has pieced together the gripping story of Theodore Roosevelt"s 1913-1914 expedition into the Brazilian equatorial forest that charted the course of the River of Doubt. The 54-year-old former president regarded the trip as his "last chance to be a boy", enjoying the skirmishes with tribesmen and wild animals and the overall adventure of the outing. 48 photos.