A Graveyard Plot — Margaret Erskine

An innocent question sent Inspector Septimus Finch on a friendly visit to the menage a trois and plunged him into malignant shadows cast by an ancient ghost, a missing diary, and a secret room.

Winifred Gore, lady novelist, possessed enough fertile passions to spin an insidious plot. Indeed her latest work contained clues sufficient to suggest that her husband, Pomfret, planned to murder her for love of his statuesque, live-in mistress, Hermione.

But the fantasy which existed in Winifred's imagination became a deadly reality when the wrong woman was murdered. From that point on, jealousy and suspicion dominated the script with graveyard grimness, and murder guided the plot....