Nemesis

Miss Marple is totally shocked to receive a letter from the recently deceased Mr Rafiel, an acquaintance she had met briefly on her travels. The letter leaves instructions for Miss Marple, whom Mr Rafiel had recognised as a natural detective, to investigate a crime after his death. There are absolutely no details about the crime, however, nothing about who is involved, or where or when it had been committed. Miss Marple, of course is thoroughly intrigued.