But I think now there is nothing further I need ask you." He indulged in a long scrutiny of the author's haggard features drawing purposely the man's eyes to his own and then meeting them with a look of power and confidence calculated to inspire even the feeblest soul with courage.

"And, to begin with," he added, smiling pleasantly, "let me a.s.sure you without delay that you need have no alarm, for you are no more insane or deluded than I myself am--"

Pender heaved a deep sigh and tried to return the smile.

"--and this is simply a case, so far as I can judge at present, of a very singular psychical invasion, and a very sinister one, too, if you perhaps understand what I mean--"

"It's an odd expression; you used it before, you know," said the author wearily, yet eagerly listening to every word of the diagnosis, and deeply touched by the intelligent sympathy which did not at once indicate the lunatic asylum.

"Possibly," returned the other, "and an odd affliction, too, you'll allow, yet one not unknown to the nations of antiquity, nor to those moderns, perhaps, who recognise the freedom of action under certain pathogenic conditions between this world and another."

"And you think," asked Pender hastily, "that it is all primarily due to the _Cannabis_? There is nothing radically amiss with myself--nothing incurable, or--?"

"Due entirely to the overdose," Dr. Silence replied emphatically, "to the drug's direct action upon your psychical being. It rendered you ultra-sensitive and made you respond to an increased rate of vibration.

And, let me tell you, Mr. Pender, that your experiment might have had results far more dire. It has brought you into touch with a somewhat singular cla.s.s of Invisible, but of one, I think, chiefly human in character. You might, however, just as easily have been drawn out of human range altogether, and the results of such a contingency would have been exceedingly terrible. Indeed, you would not now be here to tell the tale. I need not alarm you on that score, but mention it as a warning you will not misunderstand or underrate after what you have been through.

"You look puzzled. You do not quite gather what I am driving at; and it is not to be expected that you should, for you, I suppose, are the nominal Christian with the nominal Christian's lofty standard of ethics, and his utter ignorance of spiritual possibilities. Beyond a somewhat childish understanding of 'spiritual wickedness in high places,' you probably have no conception of what is possible once you break-down the slender gulf that is mercifully fixed between you and that Outer World.

But my studies and training have taken me far outside these orthodox trips, and I have made experiments that I could scarcely speak to you about in language that would be intelligible to you."

He paused a moment to note the breathless interest of Pender's face and manner. Every word he uttered was calculated; he knew exactly the value and effect of the emotions he desired to waken in the heart of the afflicted being before him.

"And from certain knowledge I have gained through various experiences,"

he continued calmly, "I can diagnose your case as I said before to be one of psychical invasion."

"And the nature of this--er--invasion?" stammered the bewildered writer of humorous tales.

"There is no reason why I should not say at once that I do not yet quite know," replied Dr. Silence. "I may first have to make one or two experiments--"

"On me?" gasped Pender, catching his breath.

"Not exactly," the doctor said, with a grave smile, "but with your a.s.sistance, perhaps. I shall want to test the conditions of the house--to ascertain, impossible, the character of the forces, of this strange personality that has been haunting you--"

"At present you have no idea exactly who--what--why--" asked the other in a wild flurry of interest, dread and amazement.

"I have a very good idea, but no proof rather," returned the doctor.

"The effects of the drug in altering the scale of time and s.p.a.ce, and merging the senses have nothing primarily to do with the invasion. They come to any one who is fool enough to take an experimental dose. It is the other features of your case that are unusual. You see, you are now in touch with certain violent emotions, desires, purposes, still active in this house, that were produced in the past by some powerful and evil personality that lived here. How long ago, or why they still persist so forcibly, I cannot positively say. But I should judge that they are merely forces acting automatically with the momentum of their terrific original impetus."

"Not directed by a living being, a conscious will, you mean?"

"Possibly not--but none the less dangerous on that account, and more difficult to deal with. I cannot explain to you in a few minutes the nature of such things, for you have not made the studies that would enable you to follow me; but I have reason to believe that on the dissolution at death of a human being, its forces may still persist and continue to act in a blind, unconscious fashion. As a rule they speedily dissipate themselves, but in the case of a very powerful personality they may last a long time. And, in some cases--of which I incline to think this is one--these forces may coalesce with certain non-human ent.i.ties who thus continue their life indefinitely and increase their strength to an unbelievable degree. If the original personality was evil, the beings attracted to the left-over forces will also be evil. In this case, I think there has been an unusual and dreadful aggrandis.e.m.e.nt of the thoughts and purposes left behind long ago by a woman of consummate wickedness and great personal power of character and intellect. Now, do you begin to see what I am driving at a little?"

Pender stared fixedly at his companion, plain horror showing in his eyes. But he found nothing to say, and the doctor continued--

"In your case, predisposed by the action of the drug, you have experienced the rush of these forces in undiluted strength. They wholly obliterate in you the sense of humour, fancy, imagination,--all that makes for cheerfulness and hope. They seek, though perhaps automatically only, to oust your own thoughts and establish themselves in their place.

You are the victim of a psychical invasion. At the same time, you have become clairvoyant in the true sense. You are also a clairvoyant victim."

Pender mopped his face and sighed. He left his chair and went over to the fireplace to warm himself.

"You must think me a quack to talk like this, or a madman," laughed Dr.

Silence. "But never mind that. I have come to help you, and I can help you if you will do what I tell you. It is very simple: you must leave this house at once. Oh, never mind the difficulties; we will deal with those together. I can place another house at your disposal, or I would take the lease here off your hands, and later have it pulled down. Your case interests me greatly, and I mean to see you through, so that you have no anxiety, and can drop back into your old groove of work tomorrow! The drug has provided you, and therefore me, with a shortcut to a very interesting experience. I am grateful to you."

The author poked the fire vigorously, emotion rising in him like a tide. He glanced towards the door nervously.

"There is no need to alarm your wife or to tell her the details of our conversation," pursued the other quietly. "Let her know that you will soon be in possession again of your sense of humour and your health, and explain that I am lending you another house for six months. Meanwhile I may have the right to use this house for a night or two for my experiment. Is that understood between us?"

"I can only thank you from the bottom of my heart," stammered Pender, unable to find words to express his grat.i.tude.

Then he hesitated for a moment, searching the doctor's face anxiously.

"And your experiment with the house?" he said at length.

"Of the simplest character, my dear Mr. Pender. Although I am myself an artificially trained psychic, and consequently aware of the presence of discarnate ent.i.ties as a rule, I have so far felt nothing here at all.

This makes me sure that the forces acting here are of an unusual description. What I propose to do is to make an experiment with a view of drawing out this evil, coaxing it from its lair, so to speak, in order that it may _exhaust itself through me_ and become dissipated for ever. I have already been inoculated," he added; "I consider myself to be immune."

"Heavens above!" gasped the author, collapsing on to a chair.

"h.e.l.l beneath! might be a more appropriate exclamation," the doctor laughed. "But, seriously, Mr. Pender, this is what I propose to do--with your permission."

"Of course, of course," cried the other, "you have my permission and my best wishes for success. I can see no possible objection, but--"

"But what?"

"I pray to Heaven you will not undertake this experiment alone, will you?"

"Oh, dear, no; not alone."

"You will take a companion with good nerves, and reliable in case of disaster, won't you?"

"I shall bring two companions," the doctor said.

"Ah, that's better. I feel easier. I am sure you must have among your acquaintances men who--"

"I shall not think of bringing men, Mr. Pender."

The other looked up sharply.

"No, or women either; or children."

"I don't understand. Who will you bring, then?"

"Animals," explained the doctor, unable to prevent a smile at his companion's expression of surprise--"two animals, a cat and a dog."

Pender stared as if his eyes would drop out upon the floor, and then led the way without another word into the adjoining room where his wife was awaiting them for tea.

II

A few days later the humorist and his wife, with minds greatly relieved, moved into a small furnished house placed at their free disposal in another part of London; and John Silence, intent upon his approaching experiment, made ready to spend a night in the empty house on the top of Putney Hill. Only two rooms were prepared for occupation: the study on the ground floor and the bedroom immediately above it; all other doors were to be locked, and no servant was to be left in the house. The motor had orders to call for him at nine o'clock the following morning.

And, meanwhile, his secretary had instructions to look up the past history and a.s.sociations of the place, and learn everything he could concerning the character of former occupants, recent or remote.