Rhianna is in trouble at school again. She just can't get her magic spells to work, and when they go wrong, they go very wrong indeed. But it's not only Rhianna who is having problems. Magic is failing everywhere, and the Land itself is at risk.

Rhianna's magic still isn't under control—but she has to harness it when she accidentally brings two iron dogs to life . ., and causes chaos in her kingdom. When her blacksmith father takes a strange girl as his apprentice, Rhianna feels that no one cares about her anymore. Filled with jealousy and hurt, she uses her Wild Magic in anger—and brings two dogs of iron to life. Suddenly, her world is in danger—not just from the dogs, but from evil forces who will want to use Rhianna's unwieldy power for their own benefit. It is up to Rhianna and the new apprentice, Eriseth, to put things right.

Rhianna ventures into the secret passageways and hidden tunnels of the castle in order to save her kingdom from evil in this magical continuation of the Rhianna Chronicles. Wild Magic is loose in the kingdom, and the Queen needs Rhianna at the Castle of Avalon. But the castle is full of secret passageways and hidden tunnels, and evil is closer than anyone thinks. Rhianna doesn't know if she's ready to face the ultimate challenge of her skill. But she doesn't have much of a choice, if the kingdom is to be saved!