From the age of thirteen when she began climbing, it was clear Lynn Hill had an unusual gift. Before long she was arguably the best rock climber in the world, establishing routes so bold and difficult that few others could follow. And in 1994, Lynn succeeded on a climb that no one--man or woman--has been able to repeat: the first "free ascent" of the Nose on Yosemite's El Capitan, which means that she climbed 3,000 feet of vertical granite without...