Every fresh fact as presented in that house that night increased rather than elucidated the mystery.
I longed to take the dead girl’s lover into my confidence and tell him, there and then, all I knew, just as I have told you; but I hesitated. Had I not given my word of honour to be silent? And, moreover, like a confounded fool, I had allowed Kirk to escape!
So now, more than ever, were my lips sealed. I was bound hand and foot.
In a few moments the four men passed out of the laboratory, while I, as I had done below, remained behind for a moment.
I stood before the furnace peering into the ashes.
I saw there something which they had overlooked, or, if they had seen it, could convey nothing to them.
Among those grey ashes lay a black horn overcoat button!
This I snatched up and transferred to my pocket.
Had that bottle of acid been purposely smashed in order to dispel any unpleasant odour arising from the furnace?
I longed to throw myself upon my knees and examine those ashes, but, alas! I dare not.
So I was compelled to follow my companions, rigid and speechless.
Chapter Ten
Leonard Langton Makes a Statement
Search of the upper portion of the premises revealed nothing – nothing, at least, to arouse the undue suspicions of the searchers.
My eager glance was everywhere, but I discerned nothing further of an unusual nature. The one great truth had become impressed upon me that the man Kirk, madman or master criminal, had got rid of the evidences of his crime.
He must have disposed of the poor girl’s body in the same manner as that of her father!
I recollected that when seated with him in Bath Road, Bedford Park, he had admitted that he possessed another home. Was it in Foley Street, that squalid house where I had heard a woman’s frantic screams?
I knew my duty, yet I still hesitated to perform it. My duty as a good citizen was to tell the police, openly and frankly, all that I knew. Yet if I did so, would I be believed? Now, after I had allowed them to search the place, I should, if I spoke, surely be suspected of trying to shield myself.
No, having assumed an attitude of ignorance, I saw I was now compelled to retain it. Kirk, clever, crafty, and far-seeing, had most ingeniously sealed my lips.
Yet why, if he were the actual criminal, had he taken me, a perfect stranger, into his confidence? And again, what connection could the Eckhardt tyre have with the strange affair?
Who were those two mysterious callers who had followed his visit, and whom Pelham had seen? What could have been their object?
I stood in the large drawing-room listening to the discussion between the searchers, who had now returned there disappointed.
“I can only repeat, sir,” remarked the inspector, addressing Langton, “that you must have been mistaken regarding the light in the window of the next room.”
“I’m certain I was not,” replied the young man doggedly. “Someone was in this house – someone who, when I rang, extinguished the light and escaped!”
“But how could he have escaped?” queried the officer.
“Ah! that’s the mystery. By the roof, perhaps.”
“The trap-door is bolted on the inside,” declared the constable; “I examined it, sir.”
“Or by a window leading out on to some leads somewhere?” I suggested.
“There are no windows unfastened by which anyone could have escaped,” the sergeant exclaimed; “I’ve looked at them all.”
“Well,” exclaimed the young man with a puzzled air, “nothing will ever convince me that I’ve brought you all here upon a fool’s errand. I still maintain that something unusual has happened. Why has Antonio fled to France?”
“We must ask the Professor,” replied the inspector. “He may have been sent by his master upon perfectly legitimate business. He was entirely trusted, you say.”
“But he saw me in the buffet at Calais, and, turning, hurried away,” Langton said. “In other circumstances he would certainly have raised his hat in greeting; he is a most polite, tactful man.”
“Well, sir,” laughed the officer, “I don’t think we can assist you any further. Just go out, 403,” he added, turning to the constable, “and tell the two men in the park that we’ve finished, and they can go back to their beats.”
“Very well, sir,” responded the man, replacing his truncheon as he left the room.
Both inspector and sergeant soon followed him, leaving Langton and myself alone.
After the front door had closed, we returned to the big dining-room.
“Well,” he exclaimed, “I don’t know what your theory is, Mr Holford, but I’m absolutely certain that something has happened here. There is some crooked circumstance,” and I saw deep lines of thought upon his shrewd, clever, clean-shaven countenance.
Why dare not Kirk meet him?
“The absence of everybody is certainly mysterious,” I admitted.
“Doubly mysterious when one takes into consideration the fact that the doors leading into the laboratory have been forced,” he remarked quickly. “Three persons dined here to-night. The Professor entertained a man-friend. Who was he?”
“That we can only discover when the servants return,” I said.
“Or from the Professor himself,” he suggested.
I held my breath. What would he have said if I had told him the truth – that the Professor was dead, and that a button from his overcoat had been lying among the ashes of the furnace?
I glanced around the comfortable room where the fire glowed cheerfully and the electric lights were so cunningly shaded. The Professor was, among other things, a connoisseur of old silver, and upon the sideboard were a number of fine Georgian pieces, tankards, salvers, candelabra, salt-cellars, decanter stands, and other things, all of which I recognised as perfect specimens.
My hand went to my jacket pocket, and I there felt the button. I withdrew my fingers in horror.
We had decided to await the return of the Professor. Await his return! Surely we would have a long time to wait for his arrival?
I was on my mettle. I alone knew the truth, and to conceal my secret knowledge from this shrewd and active young man would, I saw, be difficult.
We seated ourselves beside the fire, and, having offered me a cigarette from his case, he began to endeavour to learn more about me. But at first I was very wary, and exercised caution in my replies.
He apologised for mistaking me for an accomplice of thieves, whereat I laughed, saying:
“When we meet the Professor he will perhaps tell you of our long friendship.”