A sacred relic, a giant ruby called the Lacrima Christi, has disappeared from Greyfriars church in Canterbury. Then the owner of the ruby, Sir Walter Maltravers, is brutally murdered in the maze at his home, Ingoldby Hall. Kathryn Swynford, physician and apothecary, finds herself having to investigate both murders, while at the same time preparing for her wedding to her rugged Irish boyfriend, Colum Murtagh. Things take a turn for the worst at Ingoldby Hall as more murders occur. And then there is Kathryn's worry about her violent, abusive husband, is he really dead, or will he come back to spoil things? This is another enjoyable mystery, with interesting characters, an ingenious plot, and plenty of vivid details of medieval life. Great fun.