Thirst

By age 25, Heather Anderson had hiked what is known as the "Triple Crown" of backpacking: the Appalachian Trail (AT), Pacific Crest Trail (PCT), and Continental Divide Trail (CDT)—a combined distance of 7,900 miles with a vertical gain of more than one million feet. A few years later, she left her job, her marriage, and a dissatisfied life and walked back into those mountains.

In her new memoir, Th...