When Sydney Wignall set off on a climbing expedition to the Himalayas in the 1950s, little did he realise that he was embarking on an extraordinary and life-threatening adventure which would involve both the Indian and Chinese governments at the highest level.Betrayed by one of the many spies operating on the Nepalese border with Tibet, his group was captured by the People's Liberation Army. Their subsequent escape to freedom over the Himalayas in mid-winter is one of mountaineering's great epics.
