Since it's the only one I mentioned I'm guessing Sacramento? Great series, great arc, but I'll mention again that you need to know going in that the villains are dark. In this one specifically, there are characters who have been the victims of sexual crimes at young ages and obviously the bad guys who have a pattern of doing it.

I love all the books, but every arc gets a little more polished and this is the most recent one, so I really love it. It's just one I can't tell people to go into entirely blind.