What. The. Fuck.
So read the tags (seriously read the tags) and keep in mind that this is not and never could or would be a romance. It's creepy as fuck and dark as fuck. I want to give it 5 stars but it's so awful I feel I can't. That makes no sense I know but I'm fragile after this so cut me some slack. The story is told from various POV and it's not always clear who you are getting and that made it all the better. I just found it so clever and so well done. It kind of feels rushed at the end but I was just glad it was over.
Derek is diabolical. No redeeming features. None.