Styx and Stones by Carola Dunn

Miss Dunn's engaging sleuth The Honourable Daisy Dalrymple is pursuing her day job of free lance journalist when she is approached by her brother-in-law, Lord John Frobisher, who is the recipient of Poison Pen letters. Lord John is anxious to stop the letters whilst avoiding public scandal at all costs and so hesitates before involving the police. Daisy agrees to spend a few days at Oakhurst, the Frobisher familly home ,in the village of Rotherden Kent which is a hotbed of gossip and rumour. Discovering that Lord John is only one of several recipients of the letters Daisy is forced to reveal their existance to the police when murder is commited. Carola Dunn is one of the better writers of pastiche "Golden Age" detective stories and this is well up to her high standard.