the thing asserted were curious and rather incredible, and the tone was evidently noticed by Thorndyke as well as me for he rejoined—
"Of course he has. Why not?"
"Well, you see," replied Miss Gibson, "I have some six hundred a year of my own and should not be considered a bad match for a young man like Walter, who has neither property nor expectations, and one naturally takes that into account. But still, as I have said, I believe he is quite sincere in his professions and not merely attracted by my money."
"I do not find your opinion at all incredible," said Thorndyke, with a smile, "even if Mr. Walter were quite a mercenary young man—which, I take it, he is not."
Miss Gibson flushed very prettily as she replied—
"Oh, pray do not trouble to pay me compliments; I assure you I am by no means insensible of my merits. But with regard to Walter Hornby, I should be sorry to apply the term 'mercenary' to him, and yet—well, I have never met a young man who showed a stronger appreciation of the value of money. He means to succeed in life and I have no doubt he will."
"And do I understand that you refused him?"
"Yes. My feelings towards him are quite friendly, but not of such a nature as to allow me to contemplate marrying him."
"And now, to return for a moment to Mr. Reuben. You have known him for some years?"
"I have known him intimately for six years," replied Miss Gibson.
"And what sort of character do you give him?"
"Speaking from my own observation of him," she replied, "I can say that I have never known him to tell an untruth or do a dishonourable deed. As to theft, it is merely ridiculous. His habits have always been inexpensive and frugal, he is unambitious to a fault, and in respect to the 'main chance' his indifference is as conspicuous as Walter's keenness. He is a generous man, too, although careful and industrious."
"Thank you, Miss Gibson," said Thorndyke. "We shall apply to you for further information as the case progresses. I am sure that you will help us if you can, and that you can help us if you will, with your clear head and your admirable frankness. If you will leave us your card, Dr. Jervis and I will keep you informed of our prospects and ask for your assistance whenever we need it."
After our fair visitor had departed, Thorndyke stood for a minute or more gazing dreamily into the fire. Then, with a quick glance at his watch, he resumed his hat and, catching up the microscope, handed the camera case to me and made for the door.
"How the time goes!" he exclaimed, as we descended the stairs; "but it hasn't been wasted, Jervis, hey?"
"No, I suppose not," I answered tentatively.
"You suppose not!" he replied. "Why here is as pretty a little problem as you could desire—what would be called in the jargon of the novels, a psychological problem—and it is your business to work it out, too."
"You mean as to Miss Gibson's relations with these two young men?"
Thorndyke nodded.
"Is it any concern of ours?" I asked.
"Certainly it is," he replied. "Everything is a concern of ours at this preliminary stage. We are groping about for a clue and must let nothing pass unscrutinised."
"Well, then, to begin with, she is not wildly infatuated with Walter Hornby, I should say."
"No," agreed Thorndyke, laughing softly; "we may take it that the canny Walter has not inspired a grand passion."
"Then," I resumed, "if I were a suitor for Miss Gibson's hand, I think I would sooner stand in Reuben's shoes than in Walter's."
"There again I am with you," said Thorndyke. "Go on."
"Well," I continued, "our fair visitor conveyed to me the impression that her evident admiration of Reuben's character was tempered by something that she had heard from a third party. That expression of hers, 'speaking from my own observation,' seemed to imply that her observations of him were not in entire agreement with somebody else's."
"Good man!" exclaimed Thorndyke, slapping me on the back, to the undissembled surprise of a policeman whom we were passing; "that is what I had hoped for in you—the capacity to perceive the essential underneath the obvious. Yes; somebody has been saying something about our client, and the thing that we have to find out is, what is it that has been said and who has been saying it. We shall have to make a pretext for another interview with Miss Gibson."
"By the way, why didn't you ask her what she meant?" I asked foolishly.
Thorndyke grinned in my face. "Why didn't you?" he retorted.
"No," I rejoined, "I suppose it is not politic to appear too discerning. Let me carry the microscope for a time; it is making your arm ache, I see."
"Thanks," said he, handing the case to me and rubbing his fingers; "it is rather ponderous."
"I can't make out what you want with this great instrument," I said. "A common pocket lens would do all that you require. Besides, a six-inch objective will not magnify more than two or three diameters."
"Two, with the draw-tube closed," replied Thorndyke, "and the low-power eye-piece brings it up to four. Polton made them both for me for examining cheques, bank-notes and other large objects. But you will understand when you see me use the instrument, and remember, you are to make no comments."
We had by this time arrived at the entrance to Scotland Yard, and were passing up the narrow thoroughfare, when we encountered a uniformed official who halted and saluted my colleague.
"Ah, I thought we should see you here before long, doctor," said he genially. "I heard this morning that you have this thumb-print case in hand."
"Yes," replied Thorndyke; "I am going to see what can be done for the defence."
"Well," said the officer as he ushered us into the building, "you've given us a good many surprises, but you'll give us a bigger one if you can make anything of this. It's a foregone conclusion, I should say."
"My dear fellow," said Thorndyke, "there is no such thing. You mean that there is a prima facie case against the accused."
"Put it that way if you like," replied the officer, with a sly smile, "but I think you will find this about the hardest nut you ever tried your teeth on—and they're pretty strong teeth too, I'll say that. You had better come into Mr. Singleton's office," and he conducted us along a corridor and into a large, barely-furnished room, where we found a sedate-looking gentleman seated at a large writing table.
"How-d'ye-do, doctor?" said the latter, rising and holding out his hand. "I can guess what you've come for. Want to see that thumb-print, eh?"
"Quite right," answered Thorndyke, and then, having introduced me, he continued: "We were partners in the last game, but we are on opposite sides of the board this time."
"Yes," agreed Mr. Singleton; "and we are going to give you check-mate."
He unlocked a drawer and drew forth a small portfolio, from which he extracted a piece of paper which he laid on the table. It appeared to be a sheet torn from a perforated memorandum block, and bore the pencilled inscription: "Handed in by Reuben at 7.3 p.m., 9.3.01. J. H." At one end was a dark, glossy blood-stain, made by the falling of a good-sized drop, and this was smeared slightly, apparently by a finger or thumb having been pressed on it. Near to it were two or three smaller smears and a remarkably distinct and clean print of a thumb.
Thorndyke gazed intently at the paper for a minute or two, scrutinising the thumb-print and the smears in turn, but making no remark, while Mr. Singleton watched his impassive face with expectant curiosity.
"Not much difficulty in identifying that mark," the official at length observed.
"No," agreed Thorndyke; "it is an excellent impression and a very distinctive pattern, even without the scar."
"Yes," rejoined Mr.