Exodus is a startling vision of a dystopian future ravaged by global warming. It is 2099 - and the world is gradually drowning, as mighty Arctic ice floes melt, the seas rise and land disappears forever beneath the waves. Packed into tiny boats, fifteen year old Mara and her community begin a terrifying journey to a bizarre city that rises into the sky, built on the drowned remains of the ancient city of Glasgow. To save her people, Mara must not only find a way into the city, but also search for a new land and a new home . . .