An apparenty saintly monk, Roger Atworth has died, and a series of miracles have occured at his tomb. The order of which he was a member is hoping Roger will be made a saint, but the Archbishop of Canterbury is not keen on the idea ,he doesn't want any rival saints taking away revenue from the shrine of Thomas a Becket. So he appoints Kathryn Swinbrooke, physician and apothecary, as Devil's Advocate, her job being to argue against the beatification of Roger. Kathryn is also worried about a plague of rats that are infesting Canterbury, not to mention her personal worry over whether her abusive husband is still alive. Is she or is she not free to marry her hunky Irish boyfriend, Colum, Master of the King's horse? This is the latest volume in a very enjoyable series, Kathryn is a likeable character, though perhaps a little too good to be true, some of her opinions seem a little too modern (would any 15th century person really be so sceptical about ghosts, miracles etc?). There are some interesting supporting characters too, and the atmosphere of medieval Canterbury is vividly evoked. You learn some intersting things about the Middle Ages from this series, medical practices in those days were more effective than we realise, and there were apparently women practicing medicine then. A pity this entertaining series is not available in paperback, it should have a winder audience.