- Ordo Xenos. My favorite of the Ordos, these are the guys that hunt aliens. Yeah, it's that awesome. The one thing about Eisenhorn that the game Inquisitor does not tell you is to what order he belongs. I would have liked him a lot better if I had known that to start with.
- Deathwatch. Yeah, some Deathwatch Marines appear in this book, which is always a positive thing, as far as I am concerned. Brother Cynewulf, in particular, is one that I have heard the name of before, though I don't remember where.
- Inquisition Goodies. All the fun stuff you remember from playing Inquisitor (or not, if its numbers were anything to judge by) or the Inquisition Codices from 40k are in here!
- Intrigue. There is the expected Inquisitional politicking and backstabbing. any book about a member of the Inquisition without it would not be the same.
- Strong Warband Characters. Eisenhorn surrounds himself with a mixed bag of specialists, who are fleshed out in painstaking detail. All of his henchmen make sense, to boot. No bootshiners or porters come along for the ride. He has a pilot, a savant, and astropath, some servitors, and an Arbite along for the ride.
- First person perspective. Yeah, I still hate that. Even Abnett in his foreward says it was a terrible idea to do it. It works within this book, so I guess I better buckle down and be prepared for more of the same going into the next two books.