Sikkim: Requiem for a Himalayan Kingdom by Andrew Duff.

This is the true story of Sikkim, a tiny Buddhist kingdom in the Himalayas that survived the end of the British Empire only to be annexed by India in 1975. It tells the remarkable tale of Thondup Namgyal, the last King of Sikkim, and his American wife, Hope Cooke, thrust unwittingly into the spotlight as they sought support for Sikkim’s independence

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