The book is, The Art of Hoodoo Candle Magic by Catherine Yronwode.
I almost didn't read this book. I had been tipped off by a couple of people that everything in the book can be read for free on Cat's site. After eventually breaking down and reading it I can guarantee you that everything in the book can be found on Cat's site or easily elsewhere online. I can also assure you that this information is also the same information that she teaches in her hoodoo course, that is the candle magic part. So if you want to save money by just reading her website or even printing out pages of her website for your own personal use you can. If you want everything compiled into one book then you can purchase and read the book.
The info itself is good and gives not only a basic overview of hoodoo candle magic but also gets into some specific areas with detail, such as loading and butting candles.
The one issue I do have with the book is the author's inclusion of another man's work. The author included Mikhail Strabo's book, How To Conduct A Candlelight Service. The author is long dead but the material is presented as if it is an official collaboration between the two authors. The material of Strabo's book has a completely different tone that Yronwode's book and should not have been included in my opinion.
On a scale of 1 to 10, with 1 being the lowest and 10 being the highest, I give this book a 7. I have to take off points because the information is available for free online. If the information was not available for free online I would easily give it an 8 or 9. The information itself is still good though.