Twenty years have passed since the tiny kingdom of the Icemark last defended itself from invasion.

Now the imperial invader Scipio Bellorum is back - joined by his brutal twin sons. The Icemark's fate rests with Queen Thirrin, Oskan Witchfather - and their five strong-willed children.

But not all the royal siblings are ready for the task.

What of Medea, the dark daughter, poisoning the family from within? Or Sharley, the youngest and weakest son, strangely foretold to return with a blade of fire?