Shadow People - Emily Pearce

The city of Lumograthia used to be filled with love and joy, flowers hanging from every windowsill. Now It's just a pile of rubble. Years ago it was attacked by the Kays. A group of devilish crow like beings who have left the city in pain. No body dares to escape or they will be killed. Except a boy named Zach, who heard of a safe town on the other side of the mountains. Whatever it takes, he will get to that town, and save Lumograthia from the Kays.