"It may be the effect of this illness, but it seems to me that-"
His words were cut short by a sudden scream of "Help! Help! Murder!" With a thrill I recognized the voice of that of my friend. I rushed madly from the room on to the landing. The cries, which had sunk down into a hoarse, inarticulate shouting, came from the room which we had first visited. I dashed in, and on into the dressing-room beyond. The two Cunninghams were bending over the prostrate figure of Sherlock Holmes, the younger clutching his throat with both hands, while the elder seemed to be twisting one of his wrists. In an instant the three of us had torn them away from him, and Holmes staggered to his feet, very pale and evidently greatly exhausted.
"Arrest these men, Inspector," he gasped.
"On what charge?"
"That of murdering their coachman, William Kirwan."
The Inspector stared about him in bewilderment.
"Oh, come now, Mr. Holmes," said he at last, "I'm sure you don't really mean to-"
"Tut, man, look at their faces!" cried Holmes, curtly.
Never certainly have I seen a plainer confession of guilt upon human countenances. The older man seemed numbed and dazed with a heavy, sullen expression upon his strongly-marked face. The son, on the other hand, had dropped all that jaunty, dashing style which had characterized him, and the ferocity of a dangerous wild beast gleamed in his dark eyes and distorted his handsome features. The Inspector said nothing, but, stepping to the door, he blew his whistle. Two of his constables came at the call.
"I have no alternative, Mr. Cunningham," said he.
"I trust that this may all prove to be an absurd mistake, but you can see that Ah, would you? Drop it!" He struck out with his hand, and a revolver which the younger man was in the act of cocking clattered down upon the floor.
"Keep that," said Holmes, quietly putting his foot upon it; "you will find it useful at the trial. But this is what we really wanted." He held up a little crumpled piece of paper.
"The remainder of the sheet!" cried the Inspector.
"Precisely."
"And where was it?"
"Where I was sure it must be. I'll make the whole matter clear to you presently. I think, Colonel, that you and Watson might return now, and I will be with you again in an hour at the furthest. The Inspector and I must have a word with the prisoners, but you will certainly see me back at luncheon time."
Sherlock Holmes was as good as his word, for about one o'clock he rejoined us in the Colonel's smoking-room. He was accompanied by a little elderly gentleman, who was introduced to me as the Mr. Acton whose house had been the scene of the original burglary.
"I wished Mr. Acton to be present while I demonstrated this small matter to you," said Holmes, "for it is natural that he should take a keen interest in the details. I am afraid, my dear Colonel, that you must regret the hour that you took in such a stormy petrel as I am."
"On the contrary," answered the Colonel, warmly, "I consider it the greatest privilege to have been permitted to study your methods of working. I confess that they quite surpass my expectations, and that I am utterly unable to account for you result. I have not yet seen the vestige of a clue."
"I am afraid that my explanation may disillusion you but it has always been my habit to hide none of my methods, either from my friend Watson or from any one who might take an intelligent interest in them. But, first, as I am rather shaken by the knocking about which I had in the dressing-room, I think that I shall help myself to a dash of your brandy, Colonel. My strength had been rather tried of late."
"I trust that you had no more of those nervous attacks."
Sherlock Holmes laughed heartily. "We will come to that in its turn," said he. "I will lay an account of the case before you in its due order, showing you the various points which guided me in my decision. Pray interrupt me if there is any inference which is not perfectly clear to you.
"It is of the highest importance in the art of detection to be able to recognize, out of a number of facts, which are incidental and which vital. Otherwise your energy and attention must be dissipated instead of being concentrated. Now, in this case there was not the slightest doubt in my mind from the first that the key of the whole matter must be looked for in the scrap of paper in the dead man's hand.
"Before going into this, I would draw your attention to the fact that, if Alec Cunningham's narrative was correct, and if the assailant, after shooting William Kirwan, had instantly fled, then it obviously could not be he who tore the paper from the dead man's hand. But if it was not he, it must have been Alec Cunningham himself, for by the time that the old man had descended several servants were upon the scene. The point is a simple one, but the Inspector had overlooked it because he had started with the supposition that these county magnates had had nothing to do with the matter. Now, I make a point of never having any prejudices, and of following docilely wherever fact may lead me, and so, in the very first stage of the investigation, I found myself looking a little askance at the part which had been played by Mr. Alec Cunningham.
"And now I made a very careful examination of the corner of paper which the Inspector had submitted to us. It was at once clear to me that it formed part of a very remarkable document. Here it is. Do you not now observed something very suggestive about it?"
"It has a very irregular look," said the Colonel.
"My dear sir," cried Holmes, "there cannot be the least doubt in the world that it has been written by two persons doing alternate words. When I draw your attention to the strong t's of 'at' and 'to', and ask you to compare them with the weak ones of 'quarter' and 'twelve,' you will instantly recognize the fact. A very brief analysis of these four words would enable you to say with the utmost confidence that the 'learn' and the 'maybe' are written in the stronger hand, and the 'what' in the weaker."
"By Jove, it's as clear as day!" cried the Colonel. "Why on earth should two men write a letter in such a fashion?"
"Obviously the business was a bad one, and one of the men who distrusted the other was determined that, whatever was done, each should have an equal hand in it. Now, of the two men, it is clear that the one who wrote the 'at' and 'to' was the ringleader."
"How do you get at that?"
"We might deduce it from the mere character of the one hand as compared with the other. But we have more assured reasons than that for supposing it. If you examine this scrap with attention you will come to the conclusion that the man with the stronger hand wrote all his words first, leaving blanks for the other to fill up. These blanks were not always sufficient, and you can see that the second man had a squeeze to fit his 'quarter' in between the 'at' and the 'to,' showing that the latter were already written. The man who wrote all his words first in undoubtedly the man who planned the affair."
"Excellent!" cried Mr. Acton.
"But very superficial," said Holmes. "We come now, however, to a point which is of importance. You may not be aware that the deduction of a man's age from his writing is one which has brought to considerable accuracy by experts. In normal cases one can place a man in his true decade with tolerable confidence. I say normal cases, because ill-health and physical weakness reproduce the signs of old age, even when the invalid is a youth. In this case, looking at the bold, strong hand of the one, and the rather broken-backed appearance of the other, which still retains its legibility although the t's have begun to lose their crossing, we can say that the one was a young man and the other was advanced in years without being positively decrepit."