The rise of the Wyrm Lord - Batson, Wayne Thomas (Nelson, 2006)
Sequel to: The door within. -- "The Door Within Trilogy continues ... book 2." -- Aidan's new friend Antoinette is called to the Realm, but when she arrives to rescue Robby through his Glimpse-twin, the place is in turmoil and she must decide whether to stay loyal to the one true king or join the evil side.