I wasn't expecting much from this, and in the first few chapters, even my low expectations were met with disappointment. I realize now that that's only because I didn't have much of a foundation in the basics of philosophy to start with and thus was unable to appreciate the arguments being made. A few episodes of Crash Course Philosophy later, and this became one of my favorite reads of the year.
Kant comes up a lot, and I finally feel like I have a grasp of some of his work thanks to outstanding illustrative essays by Danny Smith and George Dunn, which focus on Christopher Nolan's Joker rather than Satan. A later essay by James Edwin Mahon really drives it home by focusing more broadly on the psychology of those we interact with in the real world.
Topics range from the umbrella categories of ontology, epistemology, and aesthetics, to the more granular stuff of logic, so it really is a smorgasbord of analytical thought focusing mostly on the nature of evil - the psychology, the history of it, etc. - more so than on the mythology of the devil, though there is plenty of that, both in the form of sympathetic apologia and the kind that looks down at the subject like a disapproving schoolmarm. Plus everything in between.
Special mentions go to the feminist examination done by Cynthia M. Jones, Sandra Hansmann, and Anne Stachura, and an objectively aesthetic evaluation of satanic metal by Nick Jones. There's so much more that I found both educational and entertaining, but those are the ones that spring most vividly to mind.
It finishes with a back and forth between two academics who have studied Satanism and the Magus of the Church of Satan himself, which reads like a long form comment section between three highly educated dudes, one of whom is a bit more opinionated than he is educated in the ways of logic/philosophy. I mostly glossed over it to get to the appendix that caps it all off at the end with brief stories of anti-social behavior suspected to have been the influence of the devil.
All in all, a very fun read, especially gratifying when paired with a psychology book such as The Mind Club, which I read concurrently with this. Psych/'sophy is a match made in heaven, and I can't wait to collect more from this series so I can do it again.