The Phoenix King - Aparna Verma

"For Elena Aadya Ravence, fire is yearning. She longs to feel worthy of her Phoenix god, of her ancestors who transformed the barren dunes of Sayon into a thriving kingdom. But though she knows the ways and wiles of the desert better than she knows her own skin, the secrets of the Eternal Flame elude her. ...

For Leo Malhari Ravence, fire is control. He is not ready to give up his crown--there's still too much work to be done to ensure his legacy remains untarnished, his family protected. ... For Yassen Knight, fire is redemption. He dreams of shedding his past as one of Sayon's most deadly assassins, of laying to rest the ghosts of those he has lost.

If joining the court of flame and serving the royal Ravence family-the very people he once swore to eliminate-will earn him that, he'll do it no matter what they ask of him"--