Kathrine Pulizter's got it all, the dream life. Living right on the edge of the city, it seems ideal. Except for the wall. The large stone wall's been there forever, keeping her inside, or something else outside. Jack's the leader of a ragtag 'army', all of whom have been exiled from the city as babies. He's living day to day, surviving on dumb luck. Two kids, out to change the world. And they might do just that.