When ex-Government minister Sir Paul Berowne & local tramp/alcoholic Harry Mack are both found with their throats cut in vestry of St Matthews Church, the police are left with an intriguing mystery. Commander Adam Dalgliesh heads a Scotland Yard unit dealing with politically sensitive crimes & this case in particular was effecting as he had known Berowne, & shortly before his resignation asked for Adam's help with a anonymous letter.