From the author of Opening the Door to Bön comes a detailed commentary on the A-tri system of Dzogchen, one of the three main transmissions of Dzogchen in the Yundrung Bön tradition. Dzogchen (Great Perfection) teaches us to discover, and continue within, the non-dual, primordial, natural state of mind. While this commentary draws on many texts, it particularly looks at the Fifteen-Session A-tri Dzogchen . Rinpoche takes us from detailed descriptions of the preliminary practices of ngondro , through the actual meditation practices of ngozhi , to the fruit of the practices, the achievement of final liberation and the rainbow body of light. Latri Nyima Dakpa Rinpoche is an artful teacher with many years of teaching students all over the world. This is an opportunity to learn a seminal Dzogchen text from a great Rinpoche. It is a direct, conversational transmission of profound wisdom, delivered with compassion and humor by a modern Bön master.