We meet the Denarians for the first time, and boy oh boy isn't Nicky someone you're going to just love to hate. Learning about the specific as opposed to general purpose of the Knights of the Cross (and meeting the other two) is neat as well. There's also more Red Court assholery, and (from here thar be spoilers) Susan's back! And kicking ass! Huge bonus points for that alone. Oh, and we see Ivy (and the world's most violently amoral babysitter) for the first time too, and there's a Marcone team-up... overall just a lot of cool stuff going on, and a definite landmark in the series.