City of Glass by Milo James Fowler
I've just finished Milo James Fowler's trilogy, a series called Spirits of the Earth. And I'd recommend each of the books. It's post-apocalyptic but not your typical slash and burn craziness where everything is simply mayhem with people trying to survive. Instead, it's a well thought through imagining of the near-future with a supernatural twist.
Here are the Goodreads links to all three books:
Book 1 - After the Sky
Book 2 - Tomorrow's Children
Book 3 - City of Glass