Uhtred is an English boy, born into the aristocracy of ninth-century Northumbria. Orphaned at ten, he is captured and adopted by a Dane and taught the Viking ways. Yet Uhtred's fate is indissolubly bound up with Alfred, King of Wessex, who rules over the only English kingdom to survive the Danish assault. He is left uncertain of his loyalties but soon he is driven to face the greatest of the Viking chieftains in a battle beside the sea.