Mixed feelings about this one. Starting with the good, I liked Thorn himself, didn't mind the time we spend with him in the book. The description and writing were both top notch, really enjoyed the flow of the writing and the word choice. There are several villains in the book, and the main two, Milburn and Irv, were highly memorable and creepy.
Moving on to the bad, I mentioned that I enjoyed the time we spent with Thorn, unfortunately, that's not a lot of time. This is one of those books that likes to jump viewpoints, which means we spend a lot of time with characters that I don't care for. I didn't care about Susan's story, and while I didn't mind the time spent with Irv and Milburn, it's still not what I came here for. It also ruins the mystery, all the reveals that should have mattered, like that Kate really was running drugs, who the killer was, etc. don't matter. This whole thing really underpins my big gripe with the novel on the whole, I was promised a dark story about a brooding antihero who, in the words of the teaser "can almost taste the rage as he stalks her killer and waits." because of the constant POV hopping, maybe a third of the novel, if that, is spent delivering on that promise.
Even the segments that do focus on Thorn don't really fulfil that. The characters talk a lot about what a dark brooding loner Thorn is, but he doesn't come off that way. He doesn't do much brooding, no more than anybody else would after finding out their mother-figure had been raped and killed, he's not much of a loner, having a small but not insubstantial social network, and describing him as "stalking [his mother figure's] killer" is being a little generous. Of the four people responsible for his mother's death, he is only directly involved in the killing of one, and even then, he fails to actually do the job himself, needing his girlfriend to do the job for him. One last note on the ugly side of the book, there's a graphic and needless rape scene in the novel that serves no purpose other than to establish our main villain as totally depraved, which we already knew. Later on he forces a couple of women to strip naked and jump out of boat for no reason at all, which just felt like and excuse to describe some T&A for the book.