1067. In the desolate wastes of Greenland, a group of hunters discover a strangely-shaped meteor which has fallen from the sky. At first, the mysterious 'sky-stone' seems to bring them good luck, healing a lame boy and guaranteeing a good catch of furs. But violence and murder soon follow in fortune's wake, as the villagers fight and struggle amongst themselves to get control of the precious stone.

Over the next six hundred years, the Sky-Stone falls into the hands of crusading knights, the wicked Sheriff of Devon, a group of radical young kabalists, the dying King Henry III and a band of travelling players. Each time, the stone brings treachery, discord and violent death to those who seek to possess it.