I have so many thoughts and tbh most of them aren't great.
I'll start with the good. I actually like the story line. Is it predictable? Absolutely, but I'm a firm believer that predictable doesn't always mean bad.
Now for the bad stuff. Everything else. 
I do not like a single character. If they all died I'd shrug my shoulders and move on. They're just so annoying that I cannot bring myself to care about them.
Lor is so weirdly self-aware of her trauma, and she keeps explaining how her behaviors are trauma responses to the audience. Her constant "I hate you" for no reason is giving me whiplash. I swear to god she's trying to gaslight me with the way she keeps talking about how she was fooled by the Sun King in the last book and that's why she can't bang it out with Nadir now. Like girl, I was there too. You literally spent the entire time talking about how it would be stupid to trust him and it was just sex, just like it was just sex with the random dude from the prison. Atlas tricked you (I guess? He was pretty clear about keeping his motivations secret though) but either way it had nothing at all to do with sex.
Also her trauma felt cringey? I know that's a terrible thing to say, but the way it was written / she talks about it it was just there for shock value, not to actually add anything to the plot.
Nadir is dumb as fucking rocks and doesn't deserve to run the kingdom any more than his dad. I'm all for a possessive MMC, but it was the

added "without my permission" to the end of "no one else touches you" that gave me the biggest of icks. Is there an instance where you would grant someone permission to touch her?!

Their entire covert operation plan was doomed from the start. The didn't even give her a fake name. He almost got caught calling her inmate and STILL didn't think to stop using it. The king apparently tortured her for weeks and she's got a pretty distinct scar on her face, but they put no effort into her being subtle/hiding her AT ALL.

The romance was very meh. The two characters were just randomly mean to create this "enemies to lovers" tension instead of them having any real conflict. The conversations just didn't make any sense either. One minute she'd be telling him he's hot, and the next she'd be like "he can't know I find him attractive." Like, what?
To top it off, them

"hiding" their fae selves because it was safer also makes no sense. It very clearly wasn't safer when they almost died multiple times and it wasn't even a thought.

I understand that the flashbacks are supposed to provide important context to the present day, but I could not bring myself to care about them.

Serce seems like a power-hungry idiot,

and I felt myself skimming through them. Maybe it was the pacing, but it just felt jarring to be ripped back and forth instead of helpful.