It has been almost a year since Peter and Julia first visited the land of Aedyn and, faced with the harsh reality of their father's remarriage and two new horrible stepsiblings, they're beginning to wonder if it was all a dream. As they run away from home one evening, they fall into a half-frozen river and find themselves back in Aedyn---but this time they've accidentally brought along their stepsister Louisa! Aedyn is deserted; the people taken captive and forced to work as slaves at the foot of a volcano on a distant island. As Peter and Julia wonder what has happened to their beloved country, a giant falcon appears and takes them to this island, the very place from which the Lord of Hosts saved his people centuries ago. The three children must find a way to save the prisoners and bring them back to Aedyn, but the earth is trembling and the volcano is starting to smoke. They're running out of time.