When the three runaways - Sal, Shilly and Skender - finally arrive at the remote island of the haunted City, home of the Sky Wardens, Sal's great-aunt, the Syndic, is determined to keep them under control. And if that means imprisonment, so be it. But the Syndic is the least of Sal's worries. The ghosts that live behind the ancient glass of the City are restless and no one knows why or what they can do.... (Publisher's blurb, back cover).