Once again, King Edward I's clerk, Hugh Corbett, is called to solve a mystery—or, at the very least, to repair the deliberate, malicious damage done his master by clearing him from suspicion. War has bled England's coffers dry, and lack of money is critical. Royal pressure convenes the wealthy church's officials for Mass, and to discuss money. During the service, Walter de Montfort, the king's enemy, dies shockingly and dramatically. There is clear evidence of murder. The appalled Edward quickly realizes that one person has a glaringly obvious motive for Walter's death, and that person is himself.