And Nothing but the Truth
There was a dead silence for a minute and a half.
Then I laughed.
“You’re mad,” I said.
“No,” said Poirot placidly. “I am not mad. It was the little discrepancy in time that first drew my attention to you—right at the beginning.”
“Discrepancy in time?” I queried, puzzled.
“But yes. You will remember that everyone agreed—you yourself included—that it took five minutes to walk from the lodge to the house—less if you took the shortcut to the terrace. But you left the house at ten minutes to nine—both by your own statement and that of Parker, and yet it was nine o’clock when you passed through the lodge gates. It was a chilly night—not an evening a man would be inclined to dawdle; why had you taken ten minutes to do a five minutes’ walk? All along I realized that we had only your statement for it that the study window was ever fastened. Ackroyd asked you if you had done so—he never looked to see. Supposing, then, that the study window was unfastened? Would there be time in that ten minutes for you to run round the outside of the house, change your shoes, climb in through the window, kill Ackroyd, and get to the gate by nine o’clock? I decided against that theory since in all probability a man as nervous as Ackroyd was that night would hear you climbing in, and then there would have been a struggle. But supposing that you killed Ackroyd before you left—as you were standing beside his chair? Then you go out of the front door, run round