This is an excellent description of the Zoroastrian faith. It begins with Zoroaster himself, dating his lifetime most probably and providing a compelling history of the man who ultimately had a tremendous influence on Western culture far greater than he could ever imagine. I believe it safe to say that he had more influence than Jesus himself, given the fact that the Zoroastrian world-view was subsequently adopted by a large contingent of ancient Jews, including Jesus, and ultimately spread around the world by Christianity and Islam.
The history of the faith itself is then presented, along with key scriptures, teachings, and rituals. This book is excellent and truly fascinating reading. The Zoroastrian faith was far ahead of its time and represented an incredible philosophical advance in the ancient world that would have been completely foreign to most of the world's inhabitants but very familiar to you and I. The attractiveness of its beliefs could not be opposed even by the strictness of the Judaic world-view. In a remarkable way, Christianity and Islam represent the triumph of Zoroastrian ideas, and I found myself strangely saddened that this religion is near extinction. There is an inspiring grandeur to this faith as presented here.
The book is well written, absolutely fascinating, balanced, and a quick read. I recommend it highly.
If you know nothing about Zoroastrianism and are looking for a basic understanding of this unique faith then start with this book. It is concise clear and covers all major points of the faith quickly and accurately. The five chapters cover Zoroaster, history, scripture, teachings and observances. The scripture section contains outtakes from not only the fragments that we have of the Avesta but also lesser known and extremely difficult to find religious texts such as the Denkard. If you want to know about Zoroastrianism this is the place to start.