The longest continuous footpath in the world, the Appalachian Trail stretches along the East Coast of the United States, from Georgia to Maine, through some of the most arresting and celebrated landscapes in America.

At the age of forty-four, in the company of his friend Stephen Katz (last seen in the bestselling Neither Here nor There), Bill Bryson set off to hike through the vast tangled woods which have been frightening sensible people for three hundred years. Ahead lay almost 2,200 miles of remote mountain wilderness filled with bears, moose, bobcats, rattlesnakes, poisonous plants, disease-bearing tics, the occasional chuckling murderer and – perhaps most alarming of all – people whose favourite pastime is discussing the relative merits of the external-frame backpack.