Describe Krakauer's successful attempt when he was 23 years old to climb the "Devils Thumb". Also, do these chapters increase his credibility for writing this book, or do they undermine his credibility by making it seem like he has his own agenda and is n

At twenty-three, Krakauer plans on an especially dangerous climb in Alaska, the Devils Thumb, and determines that he will go it alone. He is dimly aware that he might be getting in over his head, but that is part of the point, and only encourages his zeal. He is fascinated by the forbidden nature of the Thumb as well as the euphoria he will feel when he climbs it. He is certain that climbing it will be a life changing experience.