Features a practical and brilliant explanation of Garab Dorje's "Three Lines Striking the Key Points teaching". The explanation was given by Dodrupchen III, Tenpa’i Nyima, who was famous for his explanations of the theory and practice of Dzogchen. The text was later written down and included in Tenpa'i Nyima's Collected Works.  The explanation lays out Thorough Cut (Thregcho) followed by a remarkable explanation of how Direct Crossing (Thogal) and Thorough Cut work together. Introduction, translation, ample footnotes, glossary, and book design by Tony Duff.

The third Dodrupchen III, Tenpa’i Nyima, did much to clarify the teachings of Longchen Nyingthig by writing extensively about it. The text in this book is a marvelous presentation of the practice of Dzogchen by him. It is regarded as one of several texts that are essential reading for Dzogchen practitioners. Text by Dodrupchen III, Tenpa’i Nyima. Introduction, translation, ample footnotes, glossary, and book design by Tony Duff.