Clayton feels most alive when he's with his grandfather, Cool Papa Byrd, and the band of Bluesmen -- he can't wait to join them, just as soon as he has a blues song of his own. But then the unthinkable happens. Cool Papa Byrd dies, and Clayton's mother forbids Clayton from playing the blues. And Clayton knows that's no way to live. Armed with his grandfather's brown porkpie hat and his harmonica, he runs away from home in search of the Bluesmen, hoping he can join them on the road. But on the journey that takes him through the New York City subways and to Washington Square Park, Clayton learns some things that surprise him.