Janja Garnbret has nothing left to prove indoors—two Olympic golds, and more World Cup victories than any climber alive. So she heads to Céüse to attempt Bibliographie, one of the hardest routes on Earth, to discover just how far she can push herself. But when her summer project stretches into a grueling, multi-year odyssey, the woman who is used to winning is forced to confront her weaknesses like never before.