With Earth's resources and population dwindling, humanity puts everything it has left into one final generation of children. They are selected for their genius and furnished with everything they could require -- including genetically-engineered spare life forms that will ensure no child's existence is ended by something as trivial as death. But when high school student Sel is replaced by his spare after a tragic accident, his friends begin to reconsider their own identities. As they uncover the dark secrets behind their own lives, both the children and the spares set out to prove they have minds of their own.