Showing How does your garden grow? [short story] by Agatha Christie

Poirot receives a strange letter for assistance from an elderly woman, Miss Amelia Barrowby, who lives at Rosebank in Charman's Green. She is extremely vague in defining the problem, but adds several times that discretion is paramount as family is involved. The letter intrigues Poirot who has his secretary Miss Lemon draft a reply saying that he is at the lady's service.

Five days later Miss Lemon spots an announcement in the "personal column" of The Morning Post about the death of Miss Barrowby. Poirot sends a letter to Rosebank to provoke a response from the next of kin, and he duly receives a reply from Mary Delafontaine, the dead woman's niece, saying that his services are no longer required