November 1302, and Sir Hugh Corbett, Edward I's Keeper of the Secret Seal, together with his manservant, Ranulf, and messenger, Maltote, are sent to Mortlake Manor on the Norfolk coast to confront an evil rarely seen before. A man's headless corpse, its head impaled on a pole, has been found on a beach and the pretty young wife of a local baker is discovered hanging from a gallows. The scene is set for more gruesome deaths and Corbett soon realises that the icy wastes of Norfolk, where the eerie song of the Dark Angel wind chills those that live in the small villages along the coast, are just as treacherous as the silken intrigue at the royal court or the violence of London's fetid alleyways...