In the snowy land of Tibet, six great mother monasteries uphold the doctrine of the Great Secret Nyingnapa. In the east, the principal monastery of these six is the glorious and powerful Palyul. This book presents a comprehensive explanation of the extraordinary Palyul tradition and the lives of the lineage holders. Within this tradition, the Non-dual Great Seal Mahamudra-Great Perfection Ati Yoga and the Kama and Terma lineages are joined together as one great river of practice.