I really enjoy that Melissa Marr creates a world full of characters, and instead of brushing over them they are really fleshed out and given their own space and stories. So, I was glad to get to know more about Ani, and see the balance of power begin to really shift. 
 Seeing more of the high court for me was very interesting. Honestly, in the first book they were barely mentioned, but by book 3 they had definitely grown in importance to the story. I thought this book showed how even power that has remained in steady hands for so long can eventually shift, that old, seemingly stable balances can be upset. 
 The characterisation is very strong, for everyone. They all have distinct personalities and I feel like each story is unique. 
 Having said that, the problem I'm finding with the series now being so long is that I'm starting to care less and less about the characters from the first book. I've started reading book 5, and I'm just not so interested in Aislinn. I feel like because there are so, so many characters and stories it can be a bit hard to remain invested in all of them. 
 So, I appreciate the effort that has gone into character development, but I feel like now there are so many it's hard to care about what happens to some of them anymore.