Once you've read a number of the Burke books, you can pretty much anticipate how it's going to play out - the roles of the usual cast of characters, if not the nuts and bolts of how this particular plot will be resolved. (Actually, this one surprised me a little in the denouement.)
I was pretty uncomfortable with Burke's relationship with Gem - her infantilization. Come to think of it, all of his relationships with women have a similar tone, if I recall correctly. I would have to go back and re-read to be sure, and honestly, I'm not sure that I'm up for it. I appreciate Vachss' commitment to the Children of the Secret, and the dedication of his main character to ridding the world of sexual predators, but I don't know that I want to re-immerse myself in Burke's world.
Although I do also appreciate how much he loves his dog.