Del Franco gets better with each Connor Grey novel. The underlying mysteries centers around increasing fae versus Dead fae, who were recently locked out of their realm due to actions in the previous novel. Questions surround the politics of such acts, and if they are related to the taint, human-fae politics, and the darkness in Connor's own head. I find I have to read Del Franco's Grey novels closely if I want to understand the events and the complexity of the world he has imagined; no skimming allowed. I also can't imagine picking up this book randomly, without having read the first three books in the series. Many of the issues and character developments were the subject of prior novels, and the backstory is limited. I frequently get the feeling I'm missing some significance to events in book #2 (Unquiet Dreams) or #3 (Unfallen Dead) and wish I had had re-read them.