This book could be seen as a novel method of tracing the history of a scripture. Jacob P. Dalton does this by “tracing the vicissitudes of a single ritual system—that of the Gathering of Intentions Sutra (Dgongs pa ’dus pa’i mdo)—from its ninth-century origins to the present day” (xv). This tantra is referred to as the “root tantra” and is vital for understanding the history of Tibetan Buddhism, particularly the Nyingma school. This book is divided into seven chapters focusing on the various forms of the traditions surrounding this text.