Deya is taken by her own people after she discovers a dangerous truth, and is forced to stand aside while people die, not using her healing power. Caelum has a bad attitude and pushes everyone away, but they don't know it's because he has a secret that could change everything.
This is a classic enemies to lovers romance with a lot of political unrest and war thrown in. They keep getting forced together, alone, and become closer despite their best efforts.