"Anything missing, sir?" inquired Young.
"Not so far as we know," was the reply. "Don't make any excitement about it, please. He is breathing yet, isn't he?"
"Yes," answered Carroll. "He doesn't seem to be hurt-just unconscious."
"Lack of air," said the cashier. "He must have been in there all night. It's enough to kill him. Hello! I want to speak to the chief of detectives. Mr. Mallory, yes. This is the Grandison National Bank, Mr. Mallory. Can you come down at once, please, and investigate a matter of great importance?"
Fifteen minutes later Detective Mallory walked into the cashier's private office. Instantly his eyes fell upon the recumbent figure on the couch, and there came with the glimpse a strange, startled expression.
"Well, for-" he blurted. "Where did you get hold of him?"
"I found him in the vault just now when I opened it," was the reply. "Do you know him?"
"Know him?" bellowed Detective Mallory. "Know him? Why it's Professor Van Dusen, a distinguished scientist. He's the fellow they call The Thinking Machine sometimes." He paused incredulously. "Have you sent for a doctor? Well, send for one quick!"
With the tender care of a mother for her child the detective hovered about the couch whereon The Thinking Machine lay, having first opened the window, and pausing now and then to swear roundly at the physician's delay in arriving. And at last the doctor came. Quick restoratives brought the scientist to consciousness within a few minutes.
"Ah, Mr. Mallory!" he remarked weakly. "Please have the doors locked, and put somebody you can trust on guard. Don't let anyone out. I'll explain in a minute or so."
The detective rushed out of the room, returning a moment later. He found The Thinking Machine talking to the cashier.
"Have you a man named Cranston employed here in the bank?"
"Yes," replied the cashier.
"Arrest him, Mr. Mallory," directed The Thinking Machine. "Doctor, just the least bit of nitroglycerin, please, in my left arm, here. And, also, Mr. Mallory, arrest any particular chum of this man Cranston; also a young man, almost a boy, possibly employed here-probably a relative or closely connected with Cranston's chum. That will do, doctor. Thanks! Anything stolen?"
The detective glanced inquiringly at the cashier.
"No," replied that official.
The Thinking Machine dropped back on the couch, closed his eyes, and lay silent for a moment.
"Pretty bad pulse, doctor," he remarked at last. "Charge your hypodermic again. What bank is this, Mr. Mallory?"
"Grandison National," the detective informed him. "What happened to you? How did it come you were in the vault?"
"It was awful, Mr. Mallory-awful, believe me!" was the reply. "I'll tell you about it after awhile. Meanwhile be sure to get Cranston and--"
And he fainted.
Twenty-four hours' rest in his own home, under the watchful eye of a physician, restored The Thinking Machine to a physical condition almost normal. But the whys and wherefors of his mysterious presence in the vault of the bank were still matters of eager speculation, but speculation only, to both the police and the bank officials. His last words, before being removed to his own apartments, had been a warning against the further use of the vault; but no explanation accompanied it.
Meanwhile Detective Mallory and his men rounded up three prisoners-Harry Cranston, a middle aged and long trusted employee of the bank; David Ellis Burge, a young mechanical engineer with whom Cranston had been upon terms of great intimacy for many months; and Richard Folsom, a stalwart young nephew of Burge's, himself a student of mechanical engineering. They were held upon charges born in the fertile mind of Detective Mallory, carefully isolated from one another and from the outside.
The Thinking Machine told his story in detail, incident by incident, from the moment of the telephone call until the trap door closed behind him and he found himself in the vault of a bank. His listeners, Detective Mallory, President Hall and Cashier Randall of the Grandison National, and Hutchinson Hatch, reporter, absorbed it in utter amazement.
"Certainly it was the most elusive problem that has ever come under my observation," declared the diminutive man of science. "It was so elusive, so compelling, that I indiscreetly placed my life in danger twice, and I didn't know definitely what it all meant until I knew I was in the vault. No man may know that slow suffocation, that hideous gasping for breath as minute after minute went by, unless he has felt it. And, gentlemen, if I had been killed one of the most valuable minds in the sciences would have been lost. It would have been nothing less than a catastrophe." He paused and settled back into that position which was so familiar to at least two of his hearers.
"When I got the telephone call," he resumed after a moment, "it told me several things beyond the obvious. The logic of it all-and logic, gentlemen, is incontrovertible-was that some man was in danger, in danger even as he talked to me, that he had tried to reach me, seeking help, that the first interruption on the wire came because perhaps he was being choked, and that the second came-the shot which wrecked the instrument-as a desperate expedient to prevent further conversation. The scene was quite clear in my mind.
"The wire was dead then. Central didn't know the number. There was no way to get that number save by the tedious process of testing the wires in the exchange, and that might have taken days. It took only two hours or so, fortunately; but I got the number at last from which I was called; that is, I got a wire which was inexplicably dead, and assumed the rest. The number of that wire was forty-one-seventeen. The records showed the street and number of the house where it came from. Therefore I went there. Before I went I took the precaution of calling up police headquarters to see if any report of a murder or attempted murder or anything unusual had come in. Nothing had come in. This fact in itself was elucidating, because vaguely it indicated that I had been called, rather than the police, because-well, perhaps because it was not desirable for the police to know.
"Well, as I explained, I searched the house; and by the way, Mr. Mallory, I don't know if you know the advantages of always holding your dark lantern as far away from your body as possible when going into dangerous places; because if there is danger, a shot, say, the natural impulse of the person who shoots is to aim at the light. Incidentally this precaution saved my life in the cellar, when I feigned death. But I'm going a little ahead of myself.
"I found telephone number forty-one-seventeen, and there was a heavy coat of dust on the receiver. Obviously it had not been recently used. The line was dead, it is true, but the instrument was in perfect condition. There was no sign of a bullet mark anywhere round or near it. If the bullet that was fired had killed the man who had been using the line, it would not have deadened the wire; therefore instantly I saw that the line had been tapped somewhere; that this instrument had been cut off from it, and the instrument which was demolished was the one on the branch wire.
"I knew this, and was going to the window to see if the wire led up or down, when I heard some one approaching. I first supposed that the person, whoever it was, was in the room with me, the steps were so distinct; but when I flashed the light, intending at least to see him, I knew he was above me. One loses the sense of direction of sound, particularly in the dark; and it is an incontestable fact that footsteps, or any sound above, can be heard more clearly than the same sound below. Therefore I knew that some one was in the room above me. For what purpose? Possibly to disconnect the branch wire on the telephone line.
"I waited until the person, whoever it was, came down and went his way; then I found the wire, and saw where the connection had been made on it. Then I went straight down to the subcellar. There I saw this Folsom lying on the ground, bound. He was not gagged; yet he didn't answer my questions; obviously because he knew if he did he would place himself in danger. The shot was fired at me, or rather at my light, and I went through the farce which ultimately placed me in a coal bin. Then I began to get a definite idea of things from the conversation, when Cranston's name was mentioned several times.
"Folsom persisted in an outspoken declaration to reveal everything he knew, including the story of my murder. He insisted until he placed himself in grave danger, and then, under cover of utter darkness, I extended one hand and pinched him twice on the ankle. He knew then that I was not dead, that I had heard, and did the very thing I wanted him to do-begged for his life. It was a bit of justifiable duplicity. I knew if he was the man his every act so far had indicated that he would humbug Cranston and the other man into letting him go, or at least not committing another murder. Subsequent developments showed that this conjecture was correct.
"From the coal bin I went back to the subcellar, knowing positively now that there would be no one there. Those men were frightened when they left me, and men run from fright. What they would do with young Folsom I didn't know. There, with my electric light, I found the branch telephone. The transmitter box had been ruined by a shot, as I imagined. So, thus far at least, the logic of the affair was taking me some place.
"And then I followed that tunnel through the subway into another tunnel. I should not have ventured into that second tunnel had I not been fairly confident that no one else was there. In that I was mistaken. I don't know now, but I imagine that young Folsom was temporarily being held prisoner there, and that possibly Cranston was on guard. Anyway, there was a fight, and the trap door was open-the trap door into the vault. And I don't know yet whether Folsom and Cranston, if they were there, even knew I was at hand. Certainly the trap door, once closed behind me, was not opened again. And you know the rest of it." Again there was a pause, and the scientist twiddled his fingers idly.
"Now it all comes down to this," he concluded at last. "Cranston dragged Burge in to the affair,-Burge is a mechanical engineer, and a good one was needed to do this work,-they rented the house, and went to work. It took weeks, perhaps months, to do it all. Folsom in some way learned of it, and he is an honest man. He took a desperate means of getting the information into my hands, instead of the hands of the police. Why the telephone was in the house I don't know-perhaps it was already there, perhaps they had it put in. Anyway, of your prisoners, Mr. Mallory, this young Folsom is guilty only of an attempt to shield his uncle, Burge, while Cranston is the ringleader, and Burge the man who achieved the immense task of getting under the vault of the bank.
"This vault has a floor of cement, cut into small squares. The trap door is in that floor, and so perfectly concealed in the lines of the squares that it is invisible unless submitted to a close scrutiny, just as the doors in the tiled walls of the subway were invisible to a casual observer. They overcame tremendous difficulties, these two men, in cutting through the immense foundation of the vault, even the steel itself, but remember that they worked at night for weeks and weeks, and were making no mistakes. They did not actually rob the bank because, I imagine, they were awaiting the deposit there of some immense sum. Is that correct, Mr. Hall?"
President Hall started suddenly. "Yes, in a week or so we were expecting a shipment of gold from Europe-nearly three million dollars," he explained. "Think of it!"
Detective Mallory whistled. "Phew! What a haul it would have been!"
"Now, Mr. Mallory, either of these three men, if properly approached, will confess the whole thing substantially as I have told it," remarked The Thinking Machine. "But I would advise that Folsom be allowed to go. He is really a very decent sort of young man."
When they had all gone except Hatch, the eminent man of science went over and laid one hand upon the report's shoulder and squinted straight into his eyes for a moment. "You know, Mr. Hatch," he said, and there was a strange note in the irritable voice, "my first fear, when the telephone call came, was that it was you. You must be careful-very careful, always."
_______________________.
PROBLEM OF THE GHOST WOMAN.
Ruby Reagan, expert cracksman, was busily, albeit quietly, engaged in the practice of his profession. His rubber soles fell silently upon the deep carpet as he stepped into the utter gloom of the study and closed the door noiselessly behind him. For a long time he stood perfectly still, listening, feeling with that vague single sense for the presence of some one else; then he flashed his electric light. A flat topped library table was directly in front of him, littered over with books, and to his left were the bulky outlines of a roll top desk. There were some chairs, a cabinet or so, and rows of bookcases.
His scrutiny, brief but comprehensive, seemed to satisfy Reagan; for the light went out suddenly, and, turning in his tracks, he slid the bolt of the door into its socket slowly, to avoid even a click. Next he released the grips on one of the windows, for it might be necessary to leave the room that way in the event of some one entering by the single door. Then he settled down to work. First was the desk, and after a long, minute inspection of the lock he dropped on his knees before it and began trying his skeleton keys. The electric flash, with the light fixed, was on the left leaf of the desk, brightly illuminating the lock and lending a deeper glow of ruby red to his hair. On the right leaf of the desk, within instant reach, was his revolver.
It was nearly half an hour before the lock yielded, and then, with a sigh of relief, Reagan carefully pushed up the roll top. Inside he found a metal box. From a score of pigeonholes he dragged forth papers of all descriptions, ruthlessly scattering them about him after a quick examination of each in turn. Then he went through drawer after drawer, carefully scrutinizing each article before he laid it down.
"Guess it's in the box," he mused at length.
Sitting flat upon the floor, with the box between his knees, he lavished his talents upon it. After a few minutes the lock clicked, and the metal lid lifted. Again Reagan smiled, for here were packages and packages of banknotes. But after a moment they too were spilled out on the floor. It was something else he sought.
"Now, that's funny," he told himself finally. "It isn't here." He paused thoughtfully, while his eyes rested lovingly upon the packages of money. "Of course, if I can't get what I want I'll take what I can get," he went on at last. And he proceeded to stuff the money away in his pockets.