The central story was strong. Do we judge beings based on their looks or their actions? What makes a monster or an angel? Will Akiva and Karou ever have a chance to fall in love? All of these are considered and in beautiful language.
However... and this is a big however, Taylor drops in a new character, which for those who have read Strange the Dreamer, will feel all too familiar by the end. And the country that Jael has salivated about conquering, suddenly shows up. AND there's a whole 'nother level to this whole thing that gets dropped on us near the end of the final book. Where the first two books seemed to have a pretty tight story arc, this felt like Taylor wanted to include every idea for a story she'd ever had. I would still recommend it to those who have read the rest of the series, but be prepared for several Deus ex Machina moments to get us even close to an "end."