I actually enjoyed this book quite a lot. It’s not what I was looking for, or expecting, but in its own way it’s very good. I was looking for an objective biography of Bahá’u’lláh. What I found was a rather detailed, mostly devotional story of both the Báb and Bahá’u’lláh written by a believer. If that’s what you’re looking for, or are willing to read, then I’m sure you’ll enjoy this book. The language is clearly influenced by the style of the English translations of the Bahá’í Writings. It seems a little stilted and old-fashioned, but that’s not necessarily off-putting. There are lots of notes and references for those who like that type of thing. Personally, on a first reading, I generally ignore end notes. If they’re footnotes at the bottom of the page, I’ll read them. In this case, the notes are almost exclusively supporting references to source material. I ignored them this time. I would likely pay more attention on a second reading, or if I were using this book for research.
If you’re looking to learn more about the founders of this lesser known faith, this is an excellent place to start. It is more useful if you already have some understanding of the Bahá’i faith. I would recommend a more general work, such as Bahá’u’lláh And The New Era: An Introduction To The Bahá’í Faith by J.E. Esslemont if you have no knowledge of the faith. I also recommend it for students of world religions.