Strangely enough, however, a bright fire burned in the grate, while upon the table were the remains of a repast – dinner, no doubt – of which three persons had partaken. Dessert had been finished, and the three coffee-cups had been drained, while about the room was a strong odour of cigars.
Who had been entertained there by Kirk?
The set table did not, of course, strike any of my companions as at all unusual, and so they passed across to the morning-room on the opposite side of the hall, one of the constables remaining at the foot of the stairs in order to prevent the escape of any persons who might be secreted in the house.
In the dining-room I loitered, for I had noticed in the grate a quantity of burnt paper. Therefore, when I was alone, I stooped, and snatched up a few half-consumed scraps – leaves of a manuscript-book they appeared to be. But at the moment, having no time to examine them, I crushed them into the pocket of my jacket, and followed the quartet on their tour of investigation.
Every nook and corner, behind chairs, in cupboards, everywhere they searched, expecting to discover somebody secreted. But they, of course, found the house untenanted.
In the smaller drawing-room, where the clean-shaven young man had noticed the light, there was a fire burning and an odour of cigars, showing that some man or men had been in the room. What consultation, I wondered, had taken place there?
The large drawing-room – the room from whence the Professor had signalled – was cold and cheerless, while in the study nothing had apparently been disarranged.
“I think, sir,” remarked the inspector to young Langton, “that you must have been mistaken. I don’t see any evidence of the presence of thieves here. The master is away, and the servants are all out for this evening. That’s all.”
“But I’m quite certain there was a light when I first rang,” declared Langton.
“Then if anyone was here, he or she must still be here,” replied the officer with a slightly incredulous smile, while at the same moment I recollected that as dinner had been served in the dining-room, there must also have been servants there during that evening.
“Is there no other door – no back door?” I queried.
“No,” replied Langton promptly; “both front and back doors are in Sussex Place. The door leading to the park was bricked up by the Professor, as he was always afraid that undesirable people might enter and steal the secrets of his experiments. There are two locked doors leading to the laboratory, of which he always keeps the keys. I’ll show you them in a moment.” And he led the way across the landing from the study to the boudoir.
Here I noticed that the drawers of Miss Greer’s little rosewood escritoire stood open, and that upon the table was a miscellaneous collection of odds and ends; letters, fancy needlework, and other things, as though a hasty search had been made among the dead girl’s effects. To me it appeared that whoever had been making the investigation had been disturbed in the act and had escaped.
The police noticed it, while Langton exclaimed:
“Look! Ethelwynn is usually so very tidy! Somebody has, no doubt, been turning over her treasures. For what reason?” and he halted before the open door leading to the passage to the laboratory. “Look!”
Inspector, sergeant, and constable all looked, but saw nothing unusual. The door stood open – that was all.
“Don’t you see!” cried the young man excitedly. “This door – the door which Professor Greer always keeps fastened – has been burst open. Somebody has been here! I was not mistaken after all!”
And he made his way along the passage, opening the second door and entering the darkness of the great lofty room. The constable followed with his lamp, while I held behind, knowing that in a few seconds the ghastly truth must be discovered.
Langton quickly found the switch, and the place was flooded with light.
At the same moment a strong and pungent smell of some acid greeted our nostrils, causing us to catch our breath. It was due, we noticed, to a bottle of some liquid which had been knocked off the table nearest us, and lay smashed upon the tiled floor.
Full of fear and trembling, I glanced to the corner in which I had seen the Professor’s huddled-up body; but my heart gave a quick bound of joy. It was not there!
Already evidences of the double tragedy had been removed. Was it for that reason, in order to remove them, that Kershaw Kirk had been there?
“Why!” exclaimed Langton. “Look! the furnace is alight. The Professor certainly cannot be in Scotland!”
I glanced to the left where he had indicated, and saw that the good-sized brick furnace built in the right-hand wall, in which, by means of a great electric fan, the Professor could generate, by forced draught, the intense heat he sometimes required for his experiments, was aglow. A fierce fire had evidently been burning there, but it was now slowly dying out. The warmth of the laboratory and of the brickwork of the furnace showed that the draught fan must have been used.
“I wonder what the Professor has been doing to-day?” remarked the inspector, examining the place with considerable curiosity.
“I wonder rather what intruders have been doing here!” exclaimed Langton. “You forget that both doors have been forced.”
The inspector stood gazing round the place in silent wonder.
“Well,” he exclaimed at last, “I don’t see the slightest evidence of burglars here, sir.”
“They may be hidden upstairs,” suggested the young man. “Remember there are many people very anxious to obtain knowledge of the Professor’s discoveries. That is why he is always so careful to keep these doors locked. His daughter, Ethelwynn, is the only person he ever allows in here. He and she even carry in the coal for the furnace, the servants being excluded.”
“But thieves would hardly light up the furnace!” said the officer.
“Unless they wished to destroy something in the fire,” responded the other.
That suggestion held me aghast. Upon me, like a flash, came the astounding suspicion that that furnace might have been lit for the purpose of destroying the evidence of the mysterious crime. I remembered Kirk’s curious and guarded response when I had referred to the burial of the body.
Was this, then, the reason why I had found him alone in the house?
I stood staggered by the suggestion.
I was near the furnace – nearer than the others.
Then, when I found speech again, I said:
“If there are intruders in this place, they could not have escaped; they must certainly be upstairs. I agree with Mr Langton that it is certainly very curious that these doors should have been forced.”
“How did you know that the Professor is in Scotland?” he inquired of me eagerly.
In an instant I had a ready reply.
“Antonio told me so when I called on Monday.”
“Did he say when his master would be back?” asked the inspector.
“He said he expected him to return last night, as he had an engagement to go with his daughter to a ball.”
“Then he may have returned and gone to the dance,” remarked the officer. “He may also have lost his keys and been compelled to break open the doors – quite a likely circumstance. Three persons dined downstairs to-night. He and his daughter and a friend probably dined and afterwards went out; while the servants, knowing they would not return before midnight, may have followed them out to spend the evening. That at least is my theory at the present.”
“That certainly seems to be the most logical conclusion, inspector,” I remarked.
“We must search the upper premises before I accept it,” exclaimed Langton, who, I could see, was still very suspicious that something unusual had happened. The meeting with Antonio in the buffet at Calais had caused him to doubt, and most naturally so.
My eager eyes were fixed upon the glowing furnace, the large, square, iron door of which was still red-hot, though the heat was now decreasing. At the side was a large air-shaft, in which were fitted electric fans, while on the wall were three switches by which a strong forced draught could be obtained.
Before the furnace door was a portion of the tiled floor railed off, to prevent the cinders from being trodden about, and in there I saw a quantity of ashes. At the side were several large crucibles, one of which, still gripped by the iron tongs or holders, contained some metal which looked like steel.
Carelessly I made a tour of the place, passing the corner where had lain the Professor’s body. I saw that all traces of blood had been carefully removed from the tiles. No one would suspect that any tragedy had occurred there.
Was this Kirk’s work? Had the man who had such a contempt for the police – whom he denounced as red-taped blunderers – succeeded in removing all trace of the crime?
If so, was not that sufficient proof of his own guilt? Was he not fooling me when, all the time, he was the actual assassin?