Armed with a replica of the glass key, Elly leads her friends into the city to meet the dangerous and charming Lien Farwind-- leader of the Unseen. Ryan has an uncomfortable conversation with the Empress about her role in the castle. Penny struggles with her fears of returning home.
Elly, Ryan and Penny are sent on a covert mission to capture or kill the men who stole a royal item. What does Prince Atlas want with this glass key, who made it, and perhaps most importantly, what does it open?