Bright We Burn by Kiersten White

In this thrilling finale, Lada realises that it is only by destroying everything that came before - including her relationships - that she can truly build the country she wants. A lonely Mehmed knows that if Lada continues in her defiance, only death will prosper, and with Radu's return to the capital, the two must now stand together against the woman they both love, in a war against the girl prince.

Who will live? Who will die? And who will rule triumphant?