This book is a collection of 8 or 9 "dark" rituals either created by LaVey's Church of Satan or taken from different cultures. There's also some introductions and closing remarks on these cultures and the practice of ceremonial magic. And that's basically it.
This ISN'T a book for those who really want to read and learn about Satanism. That would be like trying to learn about Beethoven by looking at the sheet music for his 9th Symphony! Besides, those who believe everything on TV will be sorely disappointed that these rituals don't involve sacrificing animals, drinking blood, and all that other stuff you see in the B-movies!
This is a book for those who have already read The Satanic Bible, and may be interested in aspects and examples of group ritual, or at least in reading a little more about what LaVey has to say about Satanic ceremonial magic. Other occultists might like the book, if anything just to read another man's view of ritual & magick, and to see some more examples of ceremonies taken from different cultures. For me, I know I've seen less informative occult books that cost at least twice as much, so I say it was at least worth my $6.