Bert and Will, the twin sons of the baron of Ambercrest, are best friends. To keep them out of trouble, the baron keeps one twin in Ambercreat for the summer, while the other will be sent to The Crags. It is there, hidden in a forbidden black chamber, that one of the boys discovers a bejeweled and mysterious mirror. What is the precious object and why does it make him feel so...powerful? Soon the twins' kinship is replaced by dark magic and deceit, and a kingdom hangs dangerously in the balance.