Instantly, I turned back and swiftly crossing the square of Elm Court, dived into the burrow at its farther corner and came out into the little square of Fig Tree Court at the very moment when the mysterious stranger emerged from the burrow at the other side, so that we met face to face in the full light of the central lamp.
Naturally, I was the better prepared for the encounter and I pursued my leisurely way towards my chambers with the air of not having observed him; while he, stopping short for a moment with a wild stare at me, dashed across the square and plunged into the passage from which I had just emerged.
I did not follow him. I had seen him and had thereby confirmed a suspicion that had been growing upon me, and that was enough. For I need hardly say that the man was Anthony Wallingford. But though I was prepared for the identification, I was none the less puzzled and worried by it. Here was yet another perplexity; and I was just stepping into my entry to reflect upon it at my leisure when I became aware of hurrying footsteps in the passage through which Wallingford had come. Quickly drawing back into the deep shadow of the vestibule, I waited to see who this new-comer might be. In a few seconds he rushed out of the passage and came to a halt in the middle of the square, nearly under the lamp, where he stood for a few moments, looking to right and left and listening intently. And now I realized the justice of what Madeline had said; for, commonplace as the man was, I recognized him in an instant. Brown hat, blue serge suit, big, sandy moustache and concave, pointed nose; they were not sensational characteristics, but they identified him beyond a moment’s doubt.
Apparently, his ear must have caught the echoes of Wallingford’s footsteps, for, after a very brief pause, he started off at something approaching a trot and disappeared into the passage by which I had come and Wallingford had gone. A sudden, foolish curiosity impelled me to follow and observe the methods of this singular and artless sleuth. But I did not follow directly. Instead, I turned and ran up the other passage, which leads into the narrow part of Elm Court; and as I came flying out of the farther end of it I ran full tilt into a man who was running along the court towards the Cloisters. Of course the man was Wallingford. Who else would be running like a lunatic through the Temple at night, unless it were his pursuer?
With muttered curses but no word of recognition, he disengaged himself and pursued his way, disappearing at length round the sharp turn in the lane which leads towards the Cloisters. I did not follow him, but drew back into the dark passage and waited. Very soon another figure became visible, approaching rapidly along the dimly lighted lane. I drew farther back and presently from my hiding-place I saw the brown-hatted shadower steal past with a ridiculous air of secrecy and caution; and when he had passed, I peered out and watched his receding figure until it disappeared round the angle of the lane.
I felt half-tempted to join the absurd procession and see what eventually became of these two idiots. But I had really seen enough. I now knew that Wallingford’s “delusions” were no delusions at all and that Madeline’s story set forth nothing but the genuine, indisputable truth. And with these new facts to add to my unwelcome store of data, I walked slowly back to my chambers, cogitating as I went.
In truth, I had abundant material for reflection. The more I turned over my discoveries in Madeline’s flat the more did the incriminating evidence seem to pile up. I recalled Polton’s plainly expressed suspicion that the sender of the infernal machine was a woman; and I recalled Thorndyke’s analysis of the peculiarities of the thing with the inferences which those peculiarities suggested, and read into them a more definite meaning. I now saw what the machine had conveyed to him, and what he had been trying to make it convey to me. The unmechanical outlook combined with evident ingenuity, the unfamiliarity with ordinary mechanical appliances, the ignorance concerning the different kinds of gun-powder, the lack of those common tools which nearly every man, but hardly any woman, possesses and can use: all these peculiarities of the unknown person were feminine peculiarities. And finally, there had been the plug of knitting-wool: a most unlikely material for a man to use for such a purpose, or, indeed, to possess at all.
So my thoughts went over and over the same ground, and every time finding escape from the obvious conclusion more and more impossible. The evidence of Madeline’s complicity—at the very least—in the sending of the infernal machine appeared overwhelming. I could not reject it. Nor could I deny what the sending of it implied. It was virtually a confession of guilt. And yet, even as I admitted this to myself, I was strangely enough aware that my feelings towards Madeline remained unaltered. The rational, legal side of me condemned her. But somehow, in some incomprehensible way, that condemnation had a purely technical, academic quality. It left my loyalty and affection for her untouched.
But what of Thorndyke? Had his reasoning travelled along the same lines? If it had, there would be nothing sentimental in his attitude. He had warned me, and I knew well enough that whenever there should be evidence enough to put before a court, the law would be set in motion. What, then, was his present position? And even as I asked myself the question, there echoed uncomfortably in my mind the significant suggestion that he had thrown out only a few hours ago concerning the bottle of medicine. Evidently, he at least entertained the possibility that the Fowler’s Solution had been put into that bottle after Monkhouse’s death, and that for the express purpose of diverting suspicion from the food. The manifest implication was that he entertained the possibility that the poison had been administered in the food. But to suspect this was to suspect the person who prepared the food of being the poisoner. And the person who prepared the food was Madeline.
The question, therefore, as to Thorndyke’s state of mind was a vital one. He had expressed no suspicion of Madeline. But then he had expressed no suspicion of anybody. On the other hand, he had exonerated nobody. He was frankly observant of every member of that household. Then there was the undeniable fact that Madeline had been watched and followed. Somebody suspected her. But who? The watcher was certainly not a detective. Amateur was writ large all over him. Then it was not the police who suspected her. Apparently there remained only Thorndyke, though one would have expected him to employ a more efficient agent.