Summary: The book "India and Sikkim" by P. R. Rao delves into the historical relations between Sikkim and India from 1814 to 1970. The text discusses key events such as the British Expedition to Sikkim in 1861, the recognition of Sidkeong Namgyal as the successor to the Sikkim throne, and the constitutional developments in Sikkim. The text also highlights the geographical and ecological aspects of Sikkim, emphasizing its unique flora and fauna. It details the treaty agreements, diplomatic missions, and military expeditions that shaped the relationship between Sikkim and India. Additionally, it touches upon Sikkim's economic development, aid from India, and the political aspirations of the population. The text also sheds light on the tensions with China over the Sikkim-Tibet border and the implications of China's reluctance to recognize India's special relationship with Sikkim. Lastly, it discusses Sikkim's quest for greater autonomy and the challenges posed by external powers.