The final book in the series. After killing the king of the Unseelie, the Seelie are invading. Cassandra and Roan must unite the six Unseelie courts, as that is the only chance of survival. Unfortunately, the stone of power was destroyed and Cassandra must find another way to reclaim her powers as Mistress of Dread.
Most of the book focuses on the romance between Cassandra and Roan and negotiating with the Seelie courts. However, a large part of that focuses on Cassandra's insecurities, either because of her missing powers, the PTSD after Abellio's torture and not being to able to decide, if she should accept Roan as her mate. Fearing for the safety of the human race is, of course, a very good reason for denying him, which makes it even more surprising when she says f*** it (or rather him) after about two-thirds of the book. She wasn't even present for all of the negotiations. The best parts of the story were, when Cassandra basically bluffed the Unseelie into compliance, with Grendel's fate being the absolute highlight of the book. I wish Crawford had focused more on that.
The romance with Roan was the typical soap opera roller coaster. At some point Scarlett - who has become shadier than she used to be, I never got a good vibe from her - asks Cassandra to share intel about the rulers of the Unseelie courts, to get back in their good graces. I was pleasantly surprised when the author didn't use that (unfinished) list, to incite some strife between Roan and Cassandra at the end. Though, there is the possibility that she forgot all about it.
While I was finishing that book it occurred to me that had there been an evil twin, this really would be a classic soap opera. But then, Siofra is almost an evil twin, so a soap opera it is. Maybe, they can get the narrator from Jane the Virgin to do the audiobook, then I might add another star.
Jokes aside, the book wrapped up the story nicely, but I still find the main characters about face to be dizzying. Throughout the series, Cassandra always viewed the fae as the villains and wanted to protect the humans from them. While she kept them from senselessly killing humans, there wasn't much of that regard left. Even her relationship with Scarlett seemed kind of forced in the end. I was always waiting for a betrayal to happen.
Not the best urban fantasy series I have ever read. Crawford can't hold a candle to authors such as Ilona Andrews or Patricia Briggs.