IN THE EARLY 1970S, Poe--a quick-witted young juggler from rural Massachusetts--abandons the talent shows of his childhood in favor of a nomadic life. He hops trains, hitchhikes, lives on the streets, sleeps rough, and juggles to feed himself. A few years before, he would have been a hobo; a few decades later, he would have been homeless; but in 1973, he is just a street-juggling hippie. After roaming the country for a...