The fog had grown appreciably denser when I turned out of my entry, and, crossing the little quadrangle, strode quickly along the narrow passage that leads to the Terrace and King's Bench Walk. I was approaching the end of the passage when there came suddenly into view a shadowy figure which I recognized at once as that of the man whom I had seen when I arrived. But again I had no opportunity for a close inspection, for he had already heard my footsteps and he now started to walk away rapidly in the direction of Mitre Court. For a moment I was disposed to follow him, and did, in fact, make a few quick steps towards him—which seemed to cause him to mend his pace; but it was not directly my business to deal with loiterers, and I could have done nothing even if I had overtaken him. Accordingly I changed my direction, and crossing King's Bench Walk, bore down on Thorndyke's entry.
As I approached the house I was a little disconcerted to observe that there were now no lights in his chambers, though the windows above were lighted. I ran up the stairs, and finding the oak closed, pressed the electric bell, which I could hear ringing on the floor above. Almost immediately footsteps became audible descending the stairs and were followed by the appearance of a small gentleman whom I recognized as Thorndyke's assistant, artificer or familiar spirit, Mr. Polton. He recognized me at the same moment and greeted me with a smile that seemed to break out of the corners of his eyes and spread in a network of wrinkles over every part of his face; a sort of compound smile inasmuch as every wrinkle seemed to have a smile of its own.
"I hope, Mr. Polton," said I, "that I haven't missed the doctor."
"No, Sir," he replied. "He is up in the laboratory. We are just about to make a little experiment."
"Well, I am in no hurry. Don't disturb him. I will wait until he is at liberty."
"Unless, sir," he suggested, "you would like to come up. Perhaps you would like to see the experiment."
I closed with the offer gladly. I had never seen Thorndyke's laboratory and had often been somewhat mystified as to what he did in it. Accordingly I followed Mr. Polton up the stairs, at the top of which I found Thorndyke waiting.
"I thought it was your voice, Mayfield," said he, shaking my hand. "You are just in time to see us locate a mare's nest. Come in and lend a hand."
He led me into a large room around which I glanced curiously and not without surprise. One side was occupied by a huge copying camera, the other by a joiner's bench. A powerful back-geared lathe stood against one window, a jeweller's bench against the other, and the walls were covered with shelves and tool-racks, filled with all sorts of strange implements. From this room we passed into another which I recognized as a chemical laboratory, although most of the apparatus in it was totally unfamiliar to me.
"I had no idea," said I, "that the practice of Medical Jurisprudence involved such an outfit as this. What do you do with it all? The place is like a factory."
"It is a factory," he replied with a smile; "a place where the raw material of scientific evidence is worked up into the finished product suitable for use in courts of law."
"I don't know that that conveys much to me," said I. "But you are going to perform some sort of experiment; perhaps that will enlighten me."
"Probably it will, to some extent," he replied, "though it is only a simple affair. We have a parcel here which came by post this evening and we are going to see what is in it before we open it."
"The devil you are!" I exclaimed. "How in the name of Fortune are you going to do that?"
"We shall examine it by means of the X-rays."
"But why? Why not open it and find out what is in it in a reasonable way?"
Thorndyke chuckled softly. "We have had our little experiences, Mayfield, and we have grown wary. We don't open strange parcels nowadays until we are sure that we are not dealing with a 'Greek gift' of some sort. That is what we are going to ascertain now in respect of this."
He picked up from the bench a parcel about the size of an ordinary cigar-box and held it out for my inspection. "The overwhelming probabilities are," he continued, "that this is a perfectly innocent package. But we don't know. I am not expecting any such parcel and there are certain peculiarities about this one that attract one's attention. You notice that the entire address is in rough Roman capitals—what are commonly called 'block letters'. That is probably for the sake of distinctness; but it might possibly be done to avoid a recognizable handwriting or a possibly traceable typewriter. Then you notice that it is addressed to 'Dr. Thorndyke' and conspicuously endorsed 'personal.' Now, that is really a little odd. One understands the object of marking a letter 'personal'—to guard against its being opened and read by the wrong person. But what does it matter who opens a parcel?"
"I can't imagine why it should matter," I admitted without much conviction, "but I don't see anything in the unnecessary addition that need excite suspicion. Do you?"
"Perhaps not; but you observe that the sender was apparently anxious that the parcel should be opened by a particular person."
I shrugged my shoulders. The whole proceeding and the reasons given for it struck me as verging on farce. "Do you go through these formalities with every parcel that you receive?" I asked.
"No," he replied. "Only with those that are unexpected or offer no evidence as to their origin. But we are pretty careful. As I said just now, we have had our experiences. One of them was a box which, on being opened, discharged volumes of poisonous gas."
"The deuce!" I exclaimed, rather startled out of my scepticism and viewing the parcel with a new-born respect, not unmixed with apprehension. "Then this thing may actually be an infernal machine! Confound it all, Thorndyke! Supposing it should have a clockwork detonator, ticking away while we are talking. Hadn't you better get on with the X-rays?"
He chuckled at my sudden change of attitude. "It is all right, Mayfield. There is no clockwork. I tried it with the microphone as soon as it arrived. We always do that. And, of course, it is a thousand to one that it is just an innocent parcel. But we will just make sure and then I shall be at liberty for a chat with you."
He led the way to a staircase leading to the floor above where I was introduced to a large, bare room surrounded by long benches or tables occupied by various uncanny-looking apparatus. As soon as we entered, he placed the parcel on a raised stand while Polton turned a switch connected with a great coil; the immediate result of which was a peculiar, high-pitched, humming sound as if a gigantic mosquito had got into the room. At the same moment a glass globe that was supported on an arm behind the parcel became filled with green light and displayed a bright red spot in its interior.
"This is a necromantic sort of business, Thorndyke," said I, "only you and Mr. Polton aren't dressed for the part. You ought to have tall pointed caps and gowns covered with cabalistic signs. What is that queer humming noise?"
"That is the interrupter," he replied. "The green bulb is the Crookes's tube and the little red-hot disc inside it is the anti-cathode. I will tell you about them presently. That framed plate that Polton has is the fluorescent screen. It intercepts the X-rays and makes them visible. You shall see, when Polton has finished his inspection."
I watched Polton—who had taken the opportunity to get the first innings—holding the screen between his face and the parcel. After a few moments' inspection he turned the parcel over on its side and once more raised the screen, grazing at it with an expression of the most intense interest. Suddenly he turned to Thorndyke with a smile of perfectly incredible wrinkliness and, without a word, handed him the screen; which he held up for a few seconds and then silently passed to me.
I had never used a fluorescent screen before and I must confess that I found the experience most uncanny. As I raised it before the parcel behind which was the glowing green bulb, the parcel became invisible but in its place appeared the shadow of a pistol the muzzle of which seemed to be inserted into a jar. There were some other, smaller shadows, of which I could make nothing, but which seemed to be floating in the air.
"Better not
look too long, Mayfield," said Thorndyke. "X-rays are unwholesome things. We will take a photograph and then we can study the details at our leisure; though it is all pretty obvious."
"It isn't to me," said I. "There is a pistol and what looks like a jar. Do you take it that they are parts of an infernal machine?"
"I suppose," he replied, "we must dignify it with that name. What do you say, Polton?"
"I should call it a booby-trap, Sir," was the reply. "What you might expect from a mischievous boy of ten—rather backward for his age."
Thorndyke laughed. "Listen to the artificer," said he, "and observe how his mechanical soul is of fended by an inefficient and unmechanical attempt to blow us all up. But we won't take the inefficiency too much for granted. Let us have a photograph and then we can get to work with safety."
It seemed that this part also of the procedure was already provided for in the form of a large black envelope which Polton produced from a drawer and began forthwith to adjust in contact with the parcel; in fact the appearance of preparedness was so striking that I remarked:
"This looks like part of a regular routine. It must take up a lot of your time."
"As a matter of fact," he replied, "we don't often have to do this. I don't receive many parcels and of those that are delivered, the immense majority come from known sources and are accompanied by letters of advice. It is only the strange and questionable packages that we examine with the X-rays. Of course, this one was suspect at a glance with that disguised handwriting and the special direction as to who should open it."
"Yes, I see that now. But it must be rather uncomfortable to live in constant expectation of having bombs or poison-gas handed in by the postman."
"It isn't as bad as that," said he. "The thing has happened only three or four times in the whole of my experience. The first gift of the kind was a poisoned cigar, which I fortunately detected and which served as a very useful warning. Since then I have kept my weather eyelid lifting, as the mariners express it."
"But don't you find it rather wearing to be constantly on the lookout for some murderous attack?"
"Not at all," he answered with a laugh. "It rather adds to the zest of life. Besides, you see, Mayfield, that on the rare occasions when these trifles come my way, they are so extremely helpful."
"Helpful!" I repeated. "In the Lord's name, how?"
"In a number of ways. Consider my position, Mayfield. I am not like an Italian or Russian politician who may have scores of murderous enemies. I am a lawyer and an investigator of crime. Whoever wants to get rid of me has something to fear from me; but at any given time, there will not be more than one or two of such persons. Consequently, when I receive a gift such as the present one, it conveys to me certain items of information. Thus it informs me that some one is becoming alarmed by some proceedings on my part. That is a very valuable piece of information, for it tells me that some one of my inquiries is at least proceeding along the right lines. It is virtually an admission that I have made, or am in the way of making a point. A little consideration of the cases that I have in hand will probably suggest the identity of the sender. But on this question the thing itself will, in most cases yield quite useful information as well as telling us a good deal about the personality of the sender. Take the present case. You heard Polton's contemptuous observations on the crudity of the device. Evidently the person who sent this is not an engineer or mechanician of any kind. There is an obvious ignorance of mechanism; and yet there is a certain simple ingenuity. The thing is, in fact, as Polton said, on the level of a schoolboy's booby-trap. You must see that if we had in view two or more possible senders, these facts might enable us to exclude one and select another. But here is Polton with the photograph. Now we can consider the mechanism at our leisure."
As he spoke, Polton deposited on the bench a large porcelain dish or tray in which was a very odd-looking photograph; for the whole of it was jet-black excepting the pistol, the jar, the hinges, and a small, elongated spot, which all stood out in clear, white silhouette.
"Why," I exclaimed as I stooped over it, "that is a muzzle-loading pistol!"
"Yes," Thorndyke agreed, "and a pocket pistol, as you can tell by the absence of a trigger-guard. The trigger is probably hinged and folds forward into a recess. I daresay you know the kind of thing. They were usually rather pretty little weapons—and useful, too, for you could carry one easily in your waistcoat pocket. They had octagon barrels, which screwed off for loading, and the butts were often quite handsomely ornamented with silver mounts. They were usually sent out by the gunsmiths in little baize-lined mahogany cases with compartments for a little powder-flask and a supply of bullets."
"I wonder why he used a muzzle-loader?" said I.
"Probably because he had it. It answers the purpose as well as a modern weapon, and, as it was probably made more than a hundred years ago, it would be useless to go round the trade enquiring as to recent purchases."
"Yes, it was safer to use an old pistol than to buy a new one and leave possible tracks. But how does the thing work? I can see that the hammer is at full cock and that there is a cap on the nipple. But what fires the pistol?"
"Apparently a piece of string, which hasn't come out in the photograph except, faintly, just above that small mark—string is not dense enough to throw a shadow at the full exposure—but you see, about an inch behind the trigger, an elongated shadow. That is probably a screw-eye seen end-ways. The string is tied to the trigger, passed through the screw-eye and fastened to the lid of the box. I don't see how. There is no metal fastening, and you see that the lid is not screwed or nailed down. As to how it works; you open the lid firmly; that pulls the string tight; that pulls back the trigger and fires the pistol into the jar, which is presumably full of some explosive; the jar explodes and—up goes the donkey. There is a noble simplicity about the whole thing. How do you propose to open it, Polton?"
"I think, Sir," replied the latter, "we had better get the paper off and have a look at the box."
"Very well," said Thorndyke, "but don't take anything for granted. Make sure that the paper isn't part of the joke."
I watched Polton with intense—and far from impersonal—interest, wishing only that I could have observed him from a somewhat greater distance. But for all his contempt for the "booby-trap," he took no unnecessary risks. First, with a pair of scissors, he cut out a piece at the back and enlarged the opening so that he could peer in and inspect the top of the lid. When he had made sure that there were no pitfalls, he ran the scissors round the top and exposed the box, which he carefully lifted out of the remainder of the wrapping and laid down tenderly on the bench. It was a cigar-box of the flat type and presented nothing remarkable excepting that the lid, instead of being nailed or pinned down, was secured by a number of strips of stout adhesive paper, and bore, near the middle, a large spot of sealing-wax.
"That paper binding is quite a happy thought," remarked Thorndyke, "though it was probably put on because our friend was afraid to knock in nails. But it would be quite effective. An impatient man would cut through the front strips and then wrench the lid open. I think that blob of sealing-wax answers our question about the fastening of the string. The end of it was probably drawn through a bradawl hole in the lid and fixed with sealing wax. But it must have been an anxious business drawing it just tight enough and not too tight. I suggest, Polton, that an inch-and-a-half centre-bit hole just below and to the right of the sealing-wax would enable us to cut the string. But you had better try it with the photograph first."
Polton picked the wet photograph out of the dish and carefully laid it on the lid of the box, adjusting it so that the shadows of the hinges were opposite the actual hinges. Then with a marking-awl he pricked through the shadow of the screw-eye, and again about two inches to the right and below it.
"You are quite right, sir," said he as he removed the photograph and inspected the lid of the box. "The middle of the wax is exactly over the screw-eye. I'll just get the centre
-bit."
He bustled away down the stairs and returned in less than a minute with a brace and a large centre-bit, the point of which he inserted into the second awl-hole. Then, as Thorndyke grasped the box (and I stepped back a pace or two), he turned the brace lightly and steadily, stopping now and again to clear away the chips and examine the deepening hole. A dozen turns carried the bit through the thin lid and the remaining disc of wood was driven into the interior of the box. As soon as the hole was clear, he cautiously inserted a dentist's mirror, which he had brought up in his pocket, and with its aid examined the inside of the lid.
"I can see the string, Sir," he reported; "a bit of common white twine and it looks quite slack. I could reach it easily with a small pair of scissors."
He handed the mirror to Thorndyke, who, having confirmed his observations, produced a pair of surgical scissors from his pocket. These Polton cautiously inserted into the opening, and as he closed them there was an audible snip. Then he slowly withdrew them and again inserted the mirror.
"Its all right," said he. "The string is cut clean through. I think we can open the lid now." With a sharp penknife he cut through the paper binding-strips and then, grasping the front of the lid, continued:
"Now for it. Perhaps you two gentlemen had better stand a bit farther back, in case of accidents."
I thought the suggestion an excellent one, but as Thorndyke made no move, I had not the moral courage to adopt it. Nevertheless, I watched Polton's proceedings with my heart in my mouth. Very slowly and gently did that cunning artificer raise the lid until it had opened some two inches, when he stooped and peered in. Then, with the cheerful announcement that it was "all clear," he boldly turned it right back.
Dr. Thorndyke Omnibus Vol 5 Page 14
