This is a re-read, but I didn't review the first time, plus a double read of a novella is never a bad idea.
In fact, reading Bad Blood for the second time allowed me to view the events a little differently. What Talia does – the horrors that constitute the meat of the story – could be done without The Book. Of course, the way she does them requires supernatural aid, but the results (dead animals, broken families, etc...) are sadly and terrifyingly common. To me, that's the real horror here. The Book simply enables Talia to fulfill her desires, and any corruption, at least in my view, is actually clarity in disguise; She always was a little terror on the inside and now can she truly express herself.
I think my biggest issue (the issue that would lead me to give a 4.5 star rating if Good Reads allowed it) is that the other characters (e.g. the Kovacs and McDonald) held enough sway in the story that a little more characterization would've been nice. Of course, this could be a case of "less is more", but I do feel like something was left out.
That being said, this is the beginning of a series, and it's entirely possible – actually, probable – that what I called a lack of characterization is Elliott's way of subtly world-building without spoon-feeding the reader. I don't know. Guess I'll have to read the rest of the series to find out.
Overall, 4.5. My expectations are high.