Poirot doesn’t have much to go on, but curiously, a shoe buckle could keep an important clue. Christie utilizes her recurring nursery rhyme motif to composition the guide with clues similar to the rhyme.「うろ覚え」を「うる覚え」と書く人が結構多いような気がしますが、 どういういきさつで「うる覚え」と