[One heroine + adventure + another world]
Forty years after the catastrophe, humanity has learned to coexist with alien beasts, as if they had always been part of the world. People call the world before the catastrophe the Old World, and the world now the New World.
Humans have built shelters and surrounded them with towering walls. A new profession has emerged: the “Ironbirds,” who carry messages between shelters.
Cole has joined their ranks. On his first mission, he rescues a young woman named Ivy, and the two are soon swept up in a vast conspiracy.
Flying a lonely airship and burdened by unsolved mysteries, these two solitary souls will uncover the conspiracy beneath the gray sky and become each other’s only light.