It is four years since the virus came, killing every adult in its path. Not long after that the electricity failed. Food and water started running out. Fires raged across the country. Now Anna cares for her brother alone in a house hidden in the woods, keeping him safe from 'the Outside'. But, when the time comes, Anna knows they must leave their world and find another. By turns luminous and tender, gripping and horrifying, Anna is a haunting parable of love and loneliness; of the stories we tell to sustain us, and the lengths we will go to in order to stay alive.