On September 30, 2006 gunfire echoed through the thin air near Advance Base Camp on Cho Oyu Mountain. Frequented by thousands of climbers each year, Cho Oyu lies nineteen miles east of Mt. Everest on the border between Tibet and Nepal. To the elite mountaineering community, it offers a straightforward summit -- a warm-up climb to her formidable sister. To Tibetans, Cho Oyu promises a gateway to freedom through a secret glacial path: the Nangpa La...