Book excerpt: For some four hundred years, Hindus and Christians have been engaged in a public controversy about conversion and missionary proselytization, especially in India and the Hindu diaspora. Hindu Mission, Christian Mission reframes this controversy by shifting attention from "conversion" to a wider, interreligious study of "mission" as a category of thought and practice. Comparative theologian Reid B. Locklin traces the emergence of the nondualist Hindu teaching of Advaita Vedānta as a missionary tradition, from the eighth century to the present day, and draws this tradition into dialogue with contemporary proposals in Christian missiology. As a descriptive study of the Chinmaya Mission, the Ramakrishna Mission, and other leading Advaita mission movements, Hindu Mission, Christian Mission contributes to a growing body of scholarship on transnational Hinduism. As a speculative work of Christian comparative theology, it develops key themes from this engagement for a new, interreligious theology of mission and conversion for the twenty-first century and beyond.