On September 30, 2006, gunfire echoed through thin air on Cho Oyu Mountain. Climbers preparing to summit watched in horror as Chinese guards fired at a group of Tibetans en route to India, executing Kelsang Namtso--a seventeen-year-old Tibetan nun trying to escape religious persecution--in cold blood. The climbers had caught undeniable proof of the violent oppression Tibetans face in China on tape. Would they reveal what they had seen and captured on film, and likely lose the chance to climb in China again, or remain silent? In this affecting portrait of modern Tibet, adventure reporter Jonathan Green introduces us to the disparate band of seekers and survivors who converged at the rooftop of the world on this fateful morning, as he seeks an answer for this woman's life.