The book covers all the aspects of Buddhist Tantrikism and also removes the confusions and suspenses regarding the path followed by its sadhakas. Discussion was made on various aspects of Buddhist Tantrayana such as its origin and development, its divisions and philosophy, literature, deities, Thangka painting related to Tantra, the Siddha tradition in Tantrayana, and geographical expansion of Tantrayana in Indian Territory and also outside India.