This book presents a survey of the background, philosophy, and basic doctrines of Tantric Buddhism in Japan in the form of the Shingon tradition. In this work a careful balance is maintained between the theory of Shingon, its iconographic representation in the form of the mandala and the practice of the path to Buddhahood.
Unless you are a scholar in Buddhist studies and well-versed in the sanskrit terms as well as major and minor traditions of vajrayana buddhism, you probably should print out and have handy the "Glossary of Technical Terms" from the back of the book. I wish I had thought of it sooner. It is a fascinating book, but slow-going if, like me, you lack the technical vocabulary that is used and have to stop to look things up.