King's Coroner Matthew Cordwainer investigates the deaths by strangulation of three city prostitutes in thirteenth-century York. The investigation is complicated by the Sheriff of York’s desire to use suspicion of the murders to arrest a thief and smuggler whom Cordwainer is certain is not the culprit, and it is hindered by Cordwainer’s advanced age and physical infirmities. When Cordwainer realizes that the Prioress of Clementhorpe will be the next victim and the Sheriff refuses to help, Cordwainer must call on every resource he can find to stop the killer.