NOW A MAJOR MOTION PICTURE

Robyn Davidson's opens the memoir of her perilous journey across 1,700 miles of hostile Australian desert to the sea with only four camels and a dog for company with the following words: "I experienced that sinking feeling you get when you know you have conned yourself into doing something difficult and there's no going back."

Enduring sweltering heat, fending off poisonous snakes and lecherous men, chasing her camels when they get skittish and nursing them when they are injured, Davidson emerges as an extraordinarily courageous heroine driven by a...

In every religion I can think of, there exists some variation on the theme of abandoning the settled life and walking one's way to godliness. The Hindu Sadhu, leaving behind family and wealth to live as a beggar; the pilgrims of Compostela walking away their sins; the circumambulators of the Buddhist kora; the Hajj. What could this ritual journeying be but symbolic, idealised versions of the foraging life? By taking to the road we free ourselves of baggage, both physical and psychological. We walk back to our original condition, to our best selves.

After many thousands of...