Sean Lewis was living in Boston when he first set foot inside the Blue Hills Brewery. He was writing for "BeerAdvocate" magazine about America's craft brewers, and the then-fledgling Blue Hills was his first assignment. Lewis was immediately struck by the spirit of the brewers he met there. That visit would lead him first to an intensive study of beer-brewing, and later to a nation-spanning journey into the heart -- and the art -- of American beer making.