Book excerpt: Cullen Thomas was just like the thousands of other American kids who travel abroad after college. He was hungry for meaning and excitement beyond a nine-to-five routine, so he set off for Seoul, South Korea, to teach English and look for adventure. What he got was a three-and-a- half-year drug-crime sentence in South Korea's prisons, where the physical toll of life in a cell was coupled with the mental anguish of maintaining sanity in a world that couldn't have been more foreign. This is Thomas's unvarnished account of his eye-opening, ultimately life-affirming experience. Brother One Cell is part cautionary tale, part prison memoir, and part insightful travelogue that will appeal to a wide readership, from concerned parents to armchair adventurers.