Dumb Witness

Our intrepid detective gets a letter in the mail from an elderly woman, Miss Emily Arundell, dated several weeks before. Without saying much of anything substantive, Poirot's interests are piqued and he goes to investigate. Unfortunately, the woman is already dead-- and has been for a while. Her companion/ housekeeper has inherited the entire estate, leaving the extended family, and Miss Arundell's dog Bob, confused, angry, and financially much poorer. Poirot can't leave any mystery alone, and of course begins his investigation immediately, even though his client is deceased.