THE FIRST SIR HENRY MERRIVALE MYSTERY. When Dean Halliday becomes convinced that the malevolent ghost of Louis Playge is haunting his family estate in London, he invites Ken Bates and Detective-Inspector Masters along to Plague Court to investigate. Arriving at night, they find his aunt and fiancée preparing to exorcise the spirit in a séance run by psychic Roger Darworth. While Darworth locks himself in a stone house behind Plague Court, the séance proceeds, and at the end he is found gruesomely murdered. But who, or what, could have killed him? All the windows and doors were bolted and locked, and no one could have gotten inside. The only one who can solve the crime in this bizarre and chilling tale is locked-room expert Sir Henry Merrivale. ‘Very few detective stories baffle me nowadays, but Mr Carr’s always do’ - Agatha Christie

The Judas Window by John Dickson Carr (writing as Carter Dickson). One of the five best locked room mysteries, as selected by 14 established mystery authors and critics (All But Impossible!, 1981. ed. E. Hoch). The Case: Avory Hume is found dead with an arrow through his heart—in a study with bolted steel shutters and a heavy door LOCKED FROM THE INSIDE. In the same room James Caplon Answell lies unconscious, his clothes disordered as though from a struggle. The Attorney for the Defense: That gruff and grumbling old sleuth, Sir Henry Merrivale, who proves himself superb in court—even though his gown does tear with a rending noise as he rises majestically to open the case. The Action: Before H.M. can begin his defense, Answell, his client, rises and cries out that he is guilty. Sir Henry doesn't believe it. But proof, circumstantial evidence, and the man's own confession point to his guilt. So the great, explosive detective gets down to serious sleuthing and at last startles the crowd in the Old Bailey with a reconstruction of the crime along logical, convincing lines

Another of Carr's mysteries with a strong gothic touch, this one involving a psychic.  _________________