This book has made me feel like throne of Glass did, and I never thought I'd have that experience again. 
The main female character is a snarky, witty, sarcastic, deadly, highly trained, manipulative, princess that has an abnormally traumatic childhood and has lost everything including her family. Snowlin has severe cptsd with a very realistic representation. 
She wants revenge for what was done to her and her siblings. 
She is clever, adaptive and has made some very intriguing plans. 
Oh and did I mention the shadow daddy? He is hot as hell. The tension, the yearning... 

It's very intricate on so many levels, the characters, the story, the lore of the gods, the landscape . The story has twist and turns and will have you thinking you are clever had have everything figured out and then bam another twist.