After reading Magic in the Middle Ages, I was left with an interest in the reality that magic holds or held for people practicing it. In that book, Kieckhefer several times referred to Forbidden Rites as a study of a book of magical practices.
The thing that sets the subject of Forbidden Rites apart from other books on magical books, is the fact that it is meant to be as mundane as possible. The author presents this Necromancer's Manual as the type of book that was quite ordinary in its time, and therefore as the kind of lens through which beliefs about magical practices can be studied. One of the objects is to better understand the criticisms of magic better by understanding the practice itself.
The book does exactly that. The Necromancer's Manual itself does not disappoint. It includes, among other things, rituals to conjure a horse and an invisibility cloak, and the rituals are mostly worded in a matter of fact and quite detailed way. Kieckhefer's commentaries and explanations are thoughtful, and his analyses of the use of language, the possible origins, links between Christian, Islamic, Jewish, and Greek magical practices are insightful. My favorite segment was the chapter on demonology, which did not disappoint, neither in terms of the content nor in terms of the bibliography.
I was struck by the ways in which the practices corresponded to the way magic is represented in the Harry Potter books, but also in The Smurfs and Buffy the Vampire Slayer, and it made me appreciate those artifacts to an even greater extent.
I'll admit that half way through the book, things started to get a bit tedious for me, but as I reflected towards the end of the book on my ennui, and unpacked it, I realized it was quite unfair. I thought: well, this is just a very well executed book on a Necromancer's Manual. It is unfair because the author promised an interesting book on a book of magic, and that is exactly what he delivered. Excellent stuff!