15 yr old Abrigail Bearum a.k.a. "Abri" lives in the "Atrium" . A 200 mile building that holds thousands of people who can't escape. Being held back by the "officials" Abrigail wants to know more. Not knowing what she is feeling or what a feeling is she meets Sam a smart but mischievous and tough 15 yr old who is in the same position but in an unknown part of the building.