During our return journey, I could see by Holmes’s face that he was much puzzled by something which he had observed.  Every now and then, by an effort, he would throw off the impression, and talk as if the matter were clear, but then his doubts would settle down upon him again, and his knitted brows and abstracted eyes would show that his thoughts had gone back once more to the great dining-room of the Abbey Grange, in which this midnight tragedy had been enacted.  At last, by a sudden impulse, just as our train was crawling out of a suburban station, he sprang on to the platform and pulled me out after him.

“Excuse me, my dear fellow,” said he, as we watched the rear carriages of our train disappearing round a curve, “I am sorry to make you the victim of what may seem a mere whim, but on my life, Watson, I simply can’t leave that case in this condition.  Every instinct that I possess cries out against it.  It’s wrong—­it’s all wrong—­I’ll swear that it’s wrong.  And yet the lady’s story was complete, the maid’s corroboration was sufficient, the detail was fairly exact.  What have I to put up against that?  Three wine-glasses, that is all.  But if I had not taken things for granted, if I had examined everything with care which I should have shown had we approached the case de Novo and had no cut-and-dried story to warp my mind, should I not then have found something more definite to go upon?  Of course I should.  Sit down on this bench, Watson, until a train for Chiselhurst arrives, and allow me to lay the evidence before you, imploring you in the first instance to dismiss from your mind the idea that anything which the maid or her mistress may have said must necessarily be true.  The lady’s charming personality must not be permitted to warp our judgment.

“Surely there are details in her story which, if we looked at in cold blood, would excite our suspicion.  These burglars made a considerable haul at Sydenham a fortnight ago.  Some account of them and of their appearance was in the papers, and would naturally occur to anyone who wished to invent a story in which imaginary robbers should play a part.  As a matter of fact, burglars who have done a good stroke of business are, as a rule, only too glad to enjoy the proceeds in peace and quiet without embarking on another perilous undertaking.  Again, it is unusual for burglars to operate at so early an hour, it is unusual for burglars to strike a lady to prevent her screaming, since one would imagine that was the sure way to make her scream, it is unusual for them to commit murder when their numbers are sufficient to overpower one man, it is unusual for them to be content with a limited plunder when there was much more within their reach, and finally, I should say, that it was very unusual for such men to leave a bottle half empty.  How do all these unusuals strike you, Watson?”

“Their cumulative effect is certainly considerable, and yet each of them is quite possible in itself.  The most unusual thing of all, as it seems to me, is that the lady should be tied to the chair.”