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and looked at my watch. It had turned half-past eleven.

      "You understand," I said in a low voice, "that the danger is not over? If he is left now he will fall asleep, and in all human probability will never wake. You clearly understand that?"

      "Yes, quite clearly. I promise you he shall not be allowed to fall asleep again."

      As she spoke, she looked me full in the face for a few moments, and I noted that her eyes had a perfectly normal appearance, without any trace whatever of a squint.

      "Very well," I said. "On that understanding I will go now; and I shall hope to find our friend quite recovered at my next visit."

      I turned to the patient, who was already dozing, and shook his hand heartily.

      "Good-bye, Mr. Graves!" I said. "I am sorry to have to disturb your repose so much; but you must keep awake, you know. Won't do to go to sleep."

      "Ver' well," he replied drowsily. "Sorry t' give you all this trouble. L' keep awake. But I think you're mistak'n—"

      "He says it's very important that you shouldn't go to sleep, and that I am to see that you don't. Do you understand?"

      "Yes, I un'stan'. But why does this gennlem'n—?"

      "Now it's of no use for you to ask a lot of questions," Mrs. Schallibaum said playfully; "we'll talk to you to-morrow. Good night, doctor. I'll light you down the stairs, but I won't come down with you, or the patient will be falling asleep again."

      Taking this definite dismissal, I retired, followed by a dreamily surprised glance from the sick man. The housekeeper held the candle over the balusters until I reached the bottom of the stairs, when I perceived through the open door along the passage a glimmer of light from the carriage lamps. The coachman was standing just outside, faintly illuminated by the very dim lamplight, and as I stepped into the carriage he remarked in his Scotch dialect that I "seemed to have been makin' a nicht of it." He did not wait for any reply—none being in fact needed—but shut the door and locked it.

      I lit my little pocket-lamp and hung it on the back cushion. I even drew the board and notebook from my pocket. But it seemed rather unnecessary to take a fresh set of notes, and, to tell the truth, I rather shirked the labour, tired as I was after my late exertions; besides, I wanted to think over the events of the evening, while they were fresh in my memory. Accordingly I put away the notebook, filled and lighted my pipe, and settled myself to review the incidents attending my second visit to this rather uncanny house.

      Considered in leisurely retrospect, that visit offered quite a number of problems that called for elucidation. There was the patient's condition, for instance. Any doubt as to the cause of his symptoms was set at rest by the effect of the antidotes. Mr. Graves was certainly under the influence of morphine, and the only doubtful question was how he had become so. That he had taken the poison himself was incredible. No morphinomaniac would take such a knock-down dose. It was practically certain that the poison had been administered by someone else, and, on Mr. Weiss's own showing, there was no one but himself and the housekeeper who could have administered it. And to this conclusion all the other very queer circumstances pointed.

      What were these circumstances? They were, as I have said, numerous, though many of them seemed trivial. To begin with, Mr. Weiss's habit of appearing some time after my arrival and disappearing some time before my departure was decidedly odd. But still more odd was his sudden departure this evening on what looked like a mere pretext. That departure coincided in time with the sick man's recovery of the power of speech. Could it be that Mr. Weiss was afraid that the half-conscious man might say something compromising to him in my presence? It looked rather like it. And yet he had gone away and left me with the patient and the housekeeper.

      But when I came to think about it I remembered that Mrs. Schallibaum had shown some anxiety to prevent the patient from talking. She had interrupted him more than once, and had on two occasions broken in when he seemed to be about to ask me some question. I was "mistaken" about something. What was that something that he wanted to tell me?

      It had struck me as singular that there should be no coffee in the house, but a sufficiency of tea. Germans are not usually tea-drinkers and they do take coffee. But perhaps there was nothing in this. Rather more remarkable was the invisibility of the coachman. Why could he not be sent to fetch the coffee, and why did not he, rather than the housekeeper, come to take the place of Mr. Weiss when the latter had to go away.

      There were other points, too. I recalled the word that sounded like "Pol'n," which Mr. Graves had used in speaking to the housekeeper. Apparently it was a Christian name of some kind; but why did Mr. Graves call the woman by her Christian name when Mr. Weiss addressed her formally as Mrs. Schallibaum? And, as to the woman herself: what was the meaning of that curious disappearing squint? Physically it presented no mystery. The woman had an ordinary divergent squint, and, like many people, who suffer from this displacement, could, by a strong muscular effort, bring the eyes temporarily into their normal parallel position. I had detected the displacement when she had tried to maintain the effort too long, and the muscular control had given way. But why had she done it? Was it only feminine vanity—mere sensitiveness respecting a slight personal disfigurement? It might be so; or there might be some further motive. It was impossible to say.

      Turning this question over, I suddenly remembered the peculiarity of Mr. Weiss's spectacles. And here I met with a real poser. I had certainly seen through those spectacles as clearly as if they had been plain window-glass; and they had certainly given an inverted reflection of the candle-flame like that thrown from the surface of a concave lens. Now they obviously could not be both flat and concave; but yet they had the properties peculiar to both flatness and concavity. And there was a further difficulty. If I could see objects unaltered through them, so could Mr. Weiss. But the function of spectacles is to alter the appearances of objects, by magnification, reduction or compensating distortion. If they leave the appearances unchanged they are useless. I could make nothing of it. After puzzling over it for quite a long time, I had to give it up; which I did the less unwillingly inasmuch as the construction of Mr. Weiss's spectacles had no apparent bearing on the case.

      On arriving home, I looked anxiously at the message-book, and was relieved to find that there were no further visits to be made. Having made up a mixture for Mr. Graves and handed it to the coachman, I raked the ashes of the surgery fire together and sat down to smoke a final pipe while I reflected once more on the singular and suspicious case in which I had become involved. But fatigue soon put an end to my meditations; and having come to the conclusion that the circumstances demanded a further consultation with Thorndyke, I turned down the gas to a microscopic blue spark and betook myself to bed.

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      I rose on the following morning still possessed by the determination to make some oportunity during the day to call on Thorndyke and take his advice on the now urgent question as to what I was to do. I use the word "urgent" advisedly; for the incidents of the preceding evening had left me with the firm conviction that poison was being administered for some purpose to my mysterious patient, and that no time must be lost if his life was to be saved. Last night he had escaped only by the narrowest margin—assuming him to be still alive—and it was only my unexpectedly firm attitude that had compelled Mr. Weiss to agree to restorative measures.

      That I should be sent for again I had not the slightest expectation. If what I so strongly suspected was true, Weiss would call in some other doctor, in the hope of better luck, and it was imperative that he should be stopped before it was too late. This was my view, but I meant to have Thorndyke's opinion, and act under his direction, but

      "The best laid plans of mice and men

       Gang aft agley."

      When I came downstairs and took a preliminary glance at the rough memorandum-book, kept by the bottle-boy, or, in his absence, by the housemaid, I stood aghast. The morning's entries looked already like a sample page of the Post Office directory. The new calls alone were

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