Even as he spoke the question was answered with a tongue of thunder. Morton had just placed himself in front of the nearest window, his broad shoulders blocking the aperture. For an instant it was lit from within as with red fire, followed by a thundering throng of echoes. The square shoulders seemed to alter in shape, and the sturdy figure collapsed among the tall, rank grasses at the foot of the tower. A puff of smoke floated from the window like a little cloud. The two men behind rushed to the spot and raised him, but he was dead.
Sir Walter straightened himself and called out something that was lost in another noise of firing; it was possible that the police were already avenging their comrade from the other side. Fisher had already raced round to the next window, and a new cry of astonishment from him brought his patron to the same spot. Nolan, the Irish policeman, had also fallen, sprawling all his great length in the grass, and it was red with his blood. He was still alive when they reached him, but there was death on his face, and he was only able to make a final gesture telling them that all was over; and, with a broken word and a heroic effort, motioning them on to where his other comrades were besieging the back of the tower. Stunned by these rapid and repeated shocks, the two men could only vaguely obey the gesture, and, finding their way to the other windows at the back, they discovered a scene equally startling, if less final and tragic. The other two officers were not dead or mortally wounded, but Macbride lay with a broken leg and his ladder on top of him, evidently thrown down from the top window of the tower; while Wilson lay on his face, quite still as if stunned, with his red head among the gray and silver of the sea holly. In him, however, the impotence was but momentary, for he began to move and rise as the others came round the tower.
"My God! it's like an explosion!" cried Sir Walter; and indeed it was the only word for this unearthly energy, by which one man had been able to deal death or destruction on three sides of the same small triangle at the same instant.
Wilson had already scrambled to his feet and with splendid energy flew again at the window, revolver in hand. He fired twice into the opening and then disappeared in his own smoke; but the thud of his feet and the shock of a falling chair told them that the intrepid Londoner had managed at last to leap into the room. Then followed a curious silence; and Sir Walter, walking to the window through the thinning smoke, looked into the hollow shell of the ancient tower. Except for Wilson, staring around him, there was nobody there.
The inside of the tower was a single empty room, with nothing but a plain wooden chair and a table on which were pens, ink and paper, and the candlestick. Halfway up the high wall there was a rude timber platform under the upper window, a small loft which was more like a large shelf. It was reached only by a ladder, and it seemed to be as bare as the bare walls. Wilson completed his survey of the place and then went and stared at the things on the table. Then he silently pointed with his lean forefinger at the open page of the large notebook. The writer had suddenly stopped writing, even in the middle of a word.
"I said it was like an explosion," said Sir Walter Carey at last. "And really the man himself seems to have suddenly exploded. But he has blown himself up somehow without touching the tower. He's burst more like a bubble than a bomb."
"He has touched more valuable things than the tower," said Wilson, gloomily.
There was a long silence, and then Sir Walter said, seriously: "Well, Mr. Wilson, I am not a detective, and these unhappy happenings have left you in charge of that branch of the business. We all lament the cause of this, but I should like to say that I myself have the strongest confidence in your capacity for carrying on the work. What do you think we should do next?"
Wilson seemed to rouse himself from his depression and acknowledged the speaker's words with a warmer civility than he had hitherto shown to anybody. He called in a few of the police to assist in routing out the interior, leaving the rest to spread themselves in a search party outside.
"I think," he said, "the first thing is to make quite sure about the inside of this place, as it was hardly physically possible for him to have got outside. I suppose poor Nolan would have brought in his banshee and said it was supernaturally possible. But I've got no use for disembodied spirits when I'm dealing with facts. And the facts before me are an empty tower with a ladder, a chair, and a table."
"The spiritualists," said Sir Walter, with a smile, "would say that spirits could find a great deal of use for a table."
"I dare say they could if the spirits were on the table—in a bottle," replied Wilson, with a curl of his pale lip. "The people round here, when they're all sodden up with Irish whisky, may believe in such things. I think they want a little education in this country."
Horne Fisher's heavy eyelids fluttered in a faint attempt to rise, as if he were tempted to a lazy protest against the contemptuous tone of the investigator.
"The Irish believe far too much in spirits to believe in spiritualism," he murmured. "They know too much about 'em. If you want a simple and childlike faith in any spirit that comes along you can get it in your favorite London."
"I don't want to get it anywhere," said Wilson, shortly. "I say I'm dealing with much simpler things than your simple faith, with a table and a chair and a ladder. Now what I want to say about them at the start is this. They are all three made roughly enough of plain wood. But the table and the chair are fairly new and comparatively clean. The ladder is covered with dust and there is a cobweb under the top rung of it. That means that he borrowed the first two quite recently from some cottage, as we supposed, but the ladder has been a long time in this rotten old dustbin. Probably it was part of the original furniture, an heirloom in this magnificent palace of the Irish kings."
Again Fisher looked at him under his eyelids, but seemed too sleepy to speak, and Wilson went on with his argument.
"Now it's quite clear that something very odd has just happened in this place. The chances are ten to one, it seems to me, that it had something specially to do with this place. Probably he came here because he could do it only here; it doesn't seem very inviting otherwise. But the man knew it of old; they say it belonged to his family, so that altogether, I think, everything points to something in the construction of the tower itself."
"Your reasoning seems to me excellent," said Sir Walter, who was listening attentively. "But what could it be?"
"You see now what I mean about the ladder," went on the detective; "it's the only old piece of furniture here and the first thing that caught that cockney eye of mine. But there is something else. That loft up there is a sort of lumber room without any lumber. So far as I can see, it's as empty as everything else; and, as things are, I don't see the use of the ladder leading to it. It seems to me, as I can't find anything unusual down here, that it might pay us to look up there."
He got briskly off the table on which he was sitting (for the only chair was allotted to Sir Walter) and ran rapidly up the ladder to the platform above. He was soon followed by the others, Mr. Fisher going last, however, with an appearance of considerable nonchalance.
At this stage, however, they were destined to disappointment; Wilson nosed in every corner like a terrier and examined the roof almost in the posture of a fly, but half an hour afterward they had to confess that they were still without a clew. Sir Walter's private secretary seemed more and more threatened with inappropriate slumber, and, having been the last to climb up the ladder, seemed now to lack the energy even to climb down again.
"Come along, Fisher," called out Sir Walter from below, when the others had regained the floor. "We must consider whether we'll pull the whole place to pieces to see what it's made of."
"I'm coming in a minute," said the voice from the ledge above their heads, a voice somewhat suggestive of an articulate yawn.
"What are you waiting for?" asked Sir Walter, impatiently. "Can you see anything there?"
"Well, yes, in a way," replied the voice, vaguely. "In fact, I see it quite plain now."
"What is it?" asked Wilson, sharply, from the table on which he sat kicking his heels restlessly.
"Well, it's a man," said Horne Fisher.
Wilson bounded off the table as if