The series continues to build, and while some minor quibbles persist - e.g. it would be nice if there were as much development of the platonic relationships as the romantic ones - this book feels like Maas has really hit her stride. I know that I've become genuinely invested in a book when I start getting angry because someone does something that makes a favoured character upset.

As a side note: wow! I did not expect a pivot into such explicit sex scenes this late in the series. But some of the scenes are really, really hot.