There is a place where it is no longer possible to go outside. People have built a system based on a Utopia, but the facilities have no windows, so people can't look outside. They start to wonder why they can't even take a look if that won't harm them. But that is just the beginning of Ava's troubles as she continues to discover some of the secrets behind the system. She becomes a different person both because of the environment and because of her will, her past and her losses.