The House at Satan’s Elbow by John Dickson Carr (1965)

Garret Anderson agrees to travel to Greengrove with his old friend, Nicholas Barclay, to bear witness to recent unusual events. As they are arriving they hear a shot. Racing to the library they find Barclay’s uncle Pennington Barclay quite shaken, but unhurt. Pennington insists he was murderously attacked, shot with a blank cartridge by a …

He Who Whispers by John Dickson Carr (1946)

In the summer of 1939, Howard Brooke is living just outside the town of Chartres with his wife Georgina and son Harry. Harry, who is the apple of his parent’s eyes, has become engaged to Brooke’s secretary, Fay Seton. But when sinister rumors begin to swirl about the girl, Brooke is determined to buy her …