The city of mirrors: a novel

The conclusion to the epic adventure set in an apocalyptic America finds the colony confronting a terrifying threat in the aftermath of the destruction of the Twelve, a situation that forces Amy and her companions to confront their destinies.
"With The Twelve destroyed, many wonder if the threat to humankind also has vanished. But then a terrifying threat shudders the gates of the colony ... and Amy--the girl who must save the world, Peter, Alicia, and Michael must at last confront their destinies."--