The Phoenix King

From a stunning new voice in science fantasy comes an action-packed debut of fire magic and ancient prophecy, in which the fate of a futuristic desert kingdom rests in the hands of a princess desperate for power and an assassin with a dark secret.
"A CAPTIVATING ADVENTURE." —Peter V. Brett
The Ravani kingdom was born of a prophecy, carved from unforgiving desert sands and ruled by the Ravence bloodline: those with the power to command the Eternal Fire.
Elena Aadya is the heir to the throne—and the only Ravence who cannot wield her family’s legendary magic. As her coronation approaches, she will do whatever it takes to prove herself a worthy successor to her revered father. But she doesn’t anticipate the arrival of Yassen Knight, the notorious assassin who now claims fealty to the throne. Elena’s father might trust Yassen to be a member of her royal guard, but she is certain he is hiding something.