Karr tries to find a niche in the crowded field of Arthurian retellings by turning Kay, usually loudmouthed, bossy, and prideful, into her hero. Karr’s Kay is all those things, but he is also loyal, intelligent, and (occasionally at least) kind. The cleverness of this move is best illustrated by the fact that the reader will be more surprised by an intelligent Kay than by a Kay who is a detective: the Arthurian legend has been transferred into practically every genre at one time or another, but the character of Kay generally remains the same. (Wikipedia claims that Karr’s Kay resembles the version from the original Welsh legends, but those have long since been eclipsed.) Karr’s other move, to make Mordred less evil and more misunderstood and alienated, is less original but also well executed. The detection, in which Kay tries to plumb the truth of the poisoning death of Sir Patrise (a minor incident from Le Morte D’Arthur), is more in the vein of Poirot than Holmes, proceeding mainly via psychological insight rather than physical clues. Karr follows T.H. White in developing a magical alternative medieval England as a setting, but in the end this doesn’t play too big of a role: presumably both great detectives would have loved to be able to use Morgan Le Fay’s mirror that can see the past, but in practice it turns out to be not all that helpful. The twist that Karr throws in at the end is that it all doesn’t matter: Kay’s goal is to clear the Queen of the charge of murder, but this is accomplished in the end by the provident return of Lancelot in time to serve as her champion in the trial by combat. Kay, meanwhile, has been badly injured by the culprit he is trying to catch (just as in most of the stories, fighting is not his strong suit). The bittersweet ending gives a foretaste of the disaster that every reader knows is coming. I’m not sure if Karr could maintain this level of originality if she had to deal with the full story of Arthur, rather than a single episode that she can handle with a fairly free hand (though the history of the Orkneys does end up featuring strongly in it) — despite appearing in the title, Guinevere plays little part in the events, Arthur even less, and Lancelot is entirely absent, allowing Karr to largely avoid dealing with the central characters of the legend — but it would certainly be interesting to see her try.