Your standard post apocalyptic setting: Ash covers the earth, a small community hunkers down in an old power station tower and a girl from the past with bright blue eyes awakens, blind to the world around her. Joined by a gang of not so talkative survivors and one very talkative one, they must traverse this bleak grey world, devoid of colour, and maybe in the process inject a bit of life back into it. 

Because when things are grey, all you can try and do is see the bright side. Course it's not always so easy.