1067. In the desolate wastes of Greenland, a band of hunters stumble across a strangely-shaped stone which has fallen from the sky. At first, the mysterious 'sky-stone' seems to bring good luck. But the villagers are soon cursed with violence and murder as they fight to gain control of the precious object.

Over the next six hundred years, the Sky-Stone will fall into the hands of crusading knights, a wicked manor-lord of Devon, a group of radical young kabalists, the dying King Henry III and a band of travelling players. But treachery, discord and violent death follow for all who seek to possess it.