Sword of shadows

London, 1396. Crispin Guest, Tracker of London, crosses paths with Carantok Teague, a Cornish treasure hunter. Carantok has a map he is convinced will lead him to the sword of Excalibur, and he wants Crispin to help him find it. But when a body is discovered, Crispin's search for treasure suddenly turns into a hunt for a dangerous killer.