Overall Thoughts:
⁕ The switch to Grey and Lia Mara's perspectives was abrupt. After the intense ending of A Curse so Dark and Lonely, I wanted more insight as to how Rhen and Harper were doing. I wasn't as interested or invested in the other characters until about 100 pages in, and after that I actually liked the narrative better than in the first book.
 
⁕ A decent chunk of this story occurs when Grey and Lia Mara are traveling. A lot of character and relationship development occurs during these scenes, but it might be rough if you're a more plot-driven reader. 

⁕ Rhen's character arc is beyond extreme and frustrating. Again, we don't see things from his perspective in this one, so there's no insight to the stuff that's happening offstage. But I was totally confused by his actions until I finished the third and final book in the series.