When Jim O'Connell graduated from Harvard Medical School and was nearing the end of his residency at Massachusetts General Hospital, the chief of medicine made a proposal: Would he defer a prestigious fellowship and spend a year helping to create an organization to bring health care to homeless citizens? Jim took the job because he felt he couldn't refuse. But that year turned into his life's calling. In this illuminating book, we travel with O'Connell as he navigates the city, offering medical care, socks, soup, empathy, humor, and friendship to some of the city's most endangered citizens. He emphasizes a style of medicine in which patients come first, joined with their providers in what he calls "a system of friends." Tracy Kidder explores how a small but dedicated group of people have changed countless lives by facing one of American society's difficult problems instead of looking away.