For twelve-year-old Diego and his family, home is a prison in Cochabamba, Bolivia. His parents farmed coca, a traditional Bolivian medicinal plant, until they got caught in the middle of the government's war on drugs and were mistakenly convicted of drug possession. Diego's parents are locked up, but he can come and go, to school, to the market to sell his mother's handknitted goods, and to work as a "taxi," running errands for other prisoners. But...