In the Cambodian city of Phnom Penh stands a compound that once served as a high school. During the bloody rule of the Khmer Rouge, it was a prison where 17,000 men, women, and children were incarcerated, and only 4 emerged alive. In this documentary, two American photographers painstakingly piece together the details of the genocide that took place at S-21 through thousands of photos left behind by prison officials. The photos and interviews with former prison guards and prisoners reveal a world built on power, fear, and total disregard for human life and dignity. A BBC Production. (30 minutes)