The Rose & the Dagger by Renée Ahdieh

In a land on the brink of war, Shahrzad is forced from the arms of her beloved husband, the Caliph of Khorasan. She once thought Khalid a monster—a merciless killer of wives, responsible for immeasurable heartache and pain—but as she unravelled his secrets, she found instead an extraordinary man and a love she could not deny. Still, a curse threatens to keep Shazi and Khalid apart forever. Now she’s reunited with her family, who have found refuge in the desert  where a deadly force is gathering against Khalid—a force set on destroying his empire… Read more.