A fitting end to the trilogy, I think. The story was dark, although it lacked the bleakness of the second novel (thankfully), and John and his mom both showed growth from the previous stories. The ending (without giving anything away) was unexpected but definitely works for the characters. I am a little relieved by it, actually, even though some bad things happened to get there and a couple of them are really sad. 
 One thing I never mentioned before about these stories is John's sense of humor: he can be kind of hilarious when he's trying to avoid questions. That was largely missing from the second book, so I was glad to see it in this one. I also found his interactions with Marci sweet and surprisingly normal (even if all they really did was talk about the serial killer). Still, that was probably my favorite part of the book. Especially the scene with the homecoming invitation (haha). 
 Another thing that I found a little tedious to read is all of his intricate profiling of the killer. Obviously it's necessary because he is obsessed, but reading all the details and the parts where he tries to talk to everyone about it and implement plans....I just found myself speeding through those parts. Kind of dull, kind of necessary. Maybe necessarily dull. Being John doesn't seem like a lot of fun. I had that experience in all three books, although maybe to a lesser extent in the first one. 
 Anyway, I'm not sure I'd want to be friends with this kid, but it would be nice to have him in town when something bad was going down. Unless he suspected I was a demon, or he had the hots for me.