Cloud Cuckoo Land by Anthony Doerr

How do we weather the end of things? Constantinople, 1453: an orphaned seamstress and a cursed boy with a love for animals risk everything on opposite sides of a city wall to protect the people they love. Idaho, 2020: an impoverished, idealistic kid seeks revenge on a world that’s crumbling around him. Unknown, sometime in the future: with her tiny community in peril, Konstance is the last hope for the human race. To find a way forward, she must look to the oldest stories for guidance.