AtMidsomerPriory,hometoasmallgroupofnuns,MotherThomasAquinasisstrangledand,shortlyafterwards,asetofsilverworth￡60,000isfoundtobestolenfromthesafe.SisterCatherine,themostrecentmemberoftheorder,turnsouttobedescendedfromSirAnthonyVertue,whodonatedthepriorytothenunstwocenturiesearlierandBarnabylearnsthatiftheorderisended...