Sir Richard Haydon

In the Miss Marple short story The Idol House of Astarte, Sir Richard Haydon is a baronet who owned a house called "Silent Grove" on the edge of Dartmoor.

Sir Richard was an old college friend of Dr Pender. Shortly after buying the house, Sir Richard threw a house party and invited Dr Pender. During the party, Sir Richard was murdered, stabbed through the heart. The circumstances had been mysterious. In the words of Dr Pender, there had been, it seemed, "no mortal agency". No one had been near enough to him to stab him and the murder weapon could not be found.