Bright We Burn by Kiersten White (The Conqueror’s Saga #3)
Haunted by the sacrifices he made in Constantinople, Radu is called back to the new capital. Mehmed is building an empire, becoming the sultan his people need. But Mehmed has a secret: as emperor, he is more powerful than ever . . . and desperately lonely. Does this mean Radu can finally have more with Mehmed . . . and would he even want it?
Lada’s rule of absolute justice has created a Wallachia free of crime. But Lada won’t rest until everyone knows that her country’s borders are inviolable. Determined to send a message of defiance, she has the bodies of Mehmed’s peace envoy delivered to him, leaving Radu and Mehmed with no choice. If Lada is allowed to continue, only death will prosper. They must go to war against the girl prince.
But Mehmed knows that he loves her. He understands her. She must lose to him so he can keep her safe. Radu alone fears that they are underestimating his sister’s indomitable will. Only by destroying everything that came before–including her relationships–can Lada truly build the country she wants.
Claim the throne. Demand the crown. Rule the world.