AN EXPLOSION WAKES Asa and Rollo in the middle of the night. Its their enemy, the evil emperor Flood, destroying the homes of innocent people in his search for the two royal children! In order to protect the people around them, Asa and Rollo know they must leave and search out the man they have been avoiding all along. They sail the invisible ship Northseeker to Floods stronghold, Castle Crag. If they are lucky, they will find their mother and father in the castles dungeons. But one thing they know for sureits time for a final showdown with Flood!