A Dagger of Fire and Fate by Vera Raye

The enemy I swore I’d hate became the man I couldn’t live without. Then he betrayed me, too.
Turns out I might have been sleeping under the same roof as my father’s assassin.
Now I’m trapped in a crater that won’t let me leave, the man I’m furious at is off fighting a war I can’t join, and my favorite cousin is doing something spectacularly dangerous that I’m choosing not to think about.
The Protectorate crown is mine to carry. So I’ll run a city under siege, negotiate alliances with creatures that could crush me in one hand, and try not to miss a man who has given me every reason to stay angry.
But the crater has secrets. Someone inside these unscalable walls wants me dead. And the truth about my father’s murder is closer than I ever wanted it to be. One wrong move and I lose everything–including him.
Falling for my enemy was the risk I never wanted to take. Trusting him again might be the one that destroys me.