From the author of the beloved bestseller The Emerald Mile comes a rollicking and poignant account of the epic misadventure of two friends, zero preparation, and one dream: a 750-mile odyssey, on foot, through the heart of America's most magnificent national park and the grandest wilderness on earth.A few years after quitting his job to follow an ill-advised dream of becoming a guide on the Colorado River, Kevin Fedarko was approached by his best...