Xander Sweet goes in search of the missing sister Round, who has been hunted by the most terrible inhabitants of the new world. Who are they and why did they need a harmless eight-year-old orphan? Traces of monsters lead Xander and his friends to the walls of the most peaceful city on the mainland, but silence does not always mean peace, unless it is dead... Xander will have to get to know his world again, and the Molvars will help him in this.