In the 21st century, a virus wiped out most of humanity. Fewer than two million people survived and all their descendants have lost their sense of sight. Centuries later, humanity exists in tribal and medieval-type societies, with knowledge of the old, sighted world now lost or mythologised. The concept of vision and reading are considered to be evil incarnate, responsible for the fall of the ancient world, and those suspected of sight are executed for heresy. You are the mother to twins with sight. Their father, who was sighted, has told you about great things that are no longer possible because the knowledge exists in ancient texts that the rest of humanity cannot read. He believes sighted people still exist worldwide and has left on a mission to find them to restore the economic and techonological wonders of the ancient world. Before he leaves, he gives you all the resources you need to teach your children to read.