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 he had been kicked off it. "What do you mean?" he cried. "How can you possibly see a man?"
"I can see him through the window," replied the secretary, mildly. "I see him coming across the moor. He's making a bee line across the open country toward this tower. He evidently means to pay us a visit. And, considering who it seems to be, perhaps it would be more polite if we were all at the door to receive him." And in a leisurely manner the secretary came down the ladder.
"Who it seems to be!" repeated Sir Walter in astonishment.
"Well, I think it's the man you call Prince Michael," observed Mr. Fisher, airily. "In fact, I'm sure it is. I've seen the police portraits of him."
There was a dead silence, and Sir Walter's usually steady brain seemed to go round like a windmill.
"But, hang it all!" he said at last, "even supposing his own explosion could have thrown him half a mile away, without passing through any of the windows, and left him alive enough for a country walk – even then, why the devil should he walk in this direction? The murderer does not generally revisit the scene of his crime so rapidly as all that."
"He doesn't know yet that it is the scene of his crime," answered
Horne Fisher.
"What on earth do you mean? You credit him with rather singular absence of mind."
"Well, the truth is, it isn't the scene of his crime," said Fisher, and went and looked out of the window.
There was another silence, and then Sir Walter said, quietly: "What sort of notion have you really got in your head, Fisher? Have you developed a new theory about how this fellow escaped out of the ring round him?"
"He never escaped at all," answered the man at the window, without turning round. "He never escaped out of the ring because he was never inside the ring. He was not in this tower at all, at least not when we were surrounding it."
He turned and leaned back against the window, but, in spite of his usual listless manner, they almost fancied that the face in shadow was a little pale.
"I began to guess something of the sort when we were some way from the tower," he said. "Did you notice that sort of flash or flicker the candle gave before it was extinguished? I was almost certain it was only the last leap the flame gives when a candle burns itself out. And then I came into this room and I saw that."
He pointed at the table and Sir Walter caught his breath with a sort of curse at his own blindness. For the candle in the candlestick had obviously burned itself away to nothing and left him, mentally, at least, very completely in the dark.
"Then there is a sort of mathematical question," went on Fisher, leaning back in his limp way and looking up at the bare walls, as if tracing imaginary diagrams there. "It's not so easy for a man in the third angle to face the other two at the same moment, especially if they are at the base of an isosceles. I am sorry if it sounds like a lecture on geometry, but – "
"I'm afraid we have no time for it," said Wilson, coldly. "If this man is really coming back, I must give my orders at once."
"I think I'll go on with it, though," observed Fisher, staring at the roof with insolent serenity.
"I must ask you, Mr. Fisher, to let me conduct my inquiry on my own lines," said Wilson, firmly. "I am the officer in charge now."
"Yes," remarked Horne Fisher, softly, but with an accent that somehow chilled the hearer. "Yes. But why?"
Sir Walter was staring, for he had never seen his rather lackadaisical young friend look like that before. Fisher was looking at Wilson with lifted lids, and the eyes under them seemed to have shed or shifted a film, as do the eyes of an eagle.
"Why are you the officer in charge now?" he asked. "Why can you conduct the inquiry on your own lines now? How did it come about, I wonder, that the elder officers are not here to interfere with anything you do?"
Nobody
