Steve Adams, a retired, overweight, 61-year-old Brit, who had never hiked in his life, decided one day that he wanted an adventure. Not willing to settle for just any old adventure, he decided to hike the entire length of America's Appalachian Trail, a beguiling attraction for many hikers, both home-grown and from all corners of the globe. Stretching from Georgia to Maine, taking its travelers on a whimsical journey through national forests and parks,...