Claire and Sophie have decided to stay in Ardenthe magical land they discovered up the chimney in their late aunt's estate. The sisters have learned that they are the last descendants of the Arden prince, and only royalty with magic in their blood can awaken the unicorns. Since Sophie has does not have magic, Arden's last hope of saving the unicorns rests on Claire.
The sisters journey to Stonehaven so Claire can learn to harness her Gemmer abilities. As Claire finds her training more difficult than expected, Sophie uncovers the dangers of their situation. Can Claire prove she is the heir who was prophesized and unlock the magic of the unicornsbefore it's too late?