While the tantric Buddhism found in the Indian and Tibetan traditions is increasingly recognized, in East Asia tantric Buddhism remains largely unknown. This collection brings together twelve key essays on tantric Buddhism in East Asia, drawn from sources that are not commonly available. The collection is organized into four sections: China and Korea, Japan, Deities and Practices, and Influences on Japanese Religion. Payne's work, which brings together in one place a "critical mass" of scholarship, will create a sea change in the understanding of the history of East Asian Buddhism and Tantra.