This is an introduction to the Buddhist philosophy of Emptiness which explores a number of themes in connection with the concept of Emptiness, a highly technical but very central notion in Indo-Tibetan Buddhism. It examines the critique by the leading Nyingma school philosopher Mipham (1846-1912) formulated in his diverse writings. The book focuses on related issues such as what is negated by the doctrine of emptiness, the nature of ultimate reality, and the difference between 'extrinsic' and 'intrinsic' emptiness. Karma Phuntsho's book aptly undertakes a thematic and selective discussion of these debates and Mipham's qualms about the Gelukpa understanding of Emptiness in a mixture of narrative and analytic style.