Since escaping London's inferno, Mary and Dalip have fought monsters and won though in the magical world of Down, the most frightening monsters come from within. Now they hold the greatest of treasures: maps that reveal the way to the White City, where they can find the answers they're looking for, and learn the secrets of Down. But to get there they must rely on Crows, who has already betrayed them at every turn. As they battle their way towards the one place in all of Down without magic, they must ask themselves how far they will go to find their way home. After all, if there's one thing the White City offers those brave enough to enter, it's more than they bargained for.