Leon Logothetis's life was well plotted out for him. He was to do well in school, go to university, get a job in finance, and spend the next fifty years of his life sitting behind a slab of wood, watching the rain-slicked streets of London from thirty floors above. For a long time, he followed that script, until one day, he finally realized he was living someone else's life-a good one-but not one of his own choosing.

So he walked out of that life, and discovered the one that took him around the world. Since then, Leon has driven a broken-down English taxicab across America, offering people free rides; ridden a vintage motorbike around the world, relying solely on the kindness of strangers; and followed a fellow traveler through India without ever knowing where he was going. He has visited more than 90 countries on every continent. Along the way, he learned something about the human spirit and about the heart of this world. He learned that he needed to shed his...