War (The Four Horsemen, #2) by Laura Thalassa

They came to earth—Pestilence, War, Famine, Death—four horsemen riding their screaming steeds, racing to the corners of the world. Four horsemen with the power to destroy all of humanity.

They came to earth, and they came to end us all.

The day Jerusalem falls to the horsemen, Miriam Elmahdy knows her life is over. Houses are burning, the streets run red with blood, and a traitorous army is massacring her people. There is no surviving this, especially not once Miriam catches the eye of War himself. But when the massive and terrifying horseman corners Miriam, he calls her his heaven-sent wife, and instead of killing her, he takes her back to his camp.

Now Miriam faces a terrifying future, helplessly watching her world burn town by town, and the one responsible for it is her seemingly indestructible "husband," who refuses to let her go. But there's another side to him, one that's gentle and loving and set on winning her over, and she might not be strong enough to resist.

However, if there's one thing Miriam has learned, it's that love and war cannot coexist. She must make the ultimate choice: surrender to War and watch humankind fall, or sacrifice everything to stop him.