As I say, up till the Monday evening, my narrative might have been that of Poirot himself. I played Watson to his Sherlock. But after Monday our ways diverged. Poirot was busy on his own account. I got to hear of what he was doing, because in King’s Abbot, you get to hear of everything, but he did not take me into his confidence beforehand. And I, too, had my own preoccupations.

On looking back, the thing that strikes me most is the piecemeal character of this period. Everyone had a hand in the elucidation of the mystery. It was rather like a jigsaw puzzle to which everyone contributed their own little piece of knowledge or discovery. But their task ended there. To Poirot alone belongs the renown of fitting those pieces into their correct place.

Some of the incidents seemed at the time irrelevant and unmeaning. There was, for instance, the question of the black boots. But that comes later.⁠ ⁠… To take things strictly in chronological order, I must begin with the summons from Mrs. Ackroyd.