It's 1912. We find ourselves in Kalimpong, India, in the foothills of the Himalayas. We are in the company of the eccentric Belgian-French explorer Alexandra David-N el. She is planning a secretive, forbidden journey into Tibet ... Fast forward to the 1960s. Kalimpong has become a hotbed of espionage, denounced by the Chinese as a "nest of spies" after being used by everyone from the Russians to the CIA, the nascent Indian secret service, some...