Two hundreds years before King Kelson, the Festillic kings ruled. Corrupt and twisted, they've controlled Gwynedd for a century after massacring the rightful Haldane dynasty. But the massacre was incomplete and the grandson of a Haldane lives. He's a monk and unsuited to either a warrior or a regal life and so the cleric Camber must convince him to choose a different path for the sake of the land.
The feeling of a genuine period of early medieval history being detailed that is to be found in most of Kurtz's writing is displayed well here. You may know the conclusion to the story from the volumes that are set later on in the timeline, but despite that there's still new avenues and surprises. I'm guessing that Camber is the author's favourite, as she gives him more importance and influence than any other character in the saga. So, by knowing what will happen to him, his role as the lead in a trilogy seems at first to be odd, but the solution is elegant.
Although the charismatic Camber leads, the unsuitable Haldane heir also shines. He is both restricted by and ruined by his responsibilities. He wants to devote time to the ecclesiastical life to which he is more suited, but he must do what is necessary, whatever the pain he will suffer. Aside from the characters, it is the sense of history that most empowers this series, as the changes set in motion by Camber are corrupted by people who are less worthy. For me this is the strongest of the trilogies.