"Oh, it’s easy enough," he said, "whether it’s the true solution or not’s quite another question. You came here about twenty past ten, were let in by the maid, saw your patient, listened to what the maid had to tell you—lucky for us you took that precaution or we’d have missed all that evidence, since she can’t tell us now—and left this house at twenty-five to eleven. We came back again, just an hour later. The business was done in between those times, obviously."
"Not much theory there," the doctor pointed out.
"I’m simply trying it over in my mind," Sir Clinton explained, "and it’s just as well to have the time-limits clear to start with. Now we go on. Some time after you had got clear away from here, the murderer comes along. Let’s call that person X, just to avoid all prejudice about age or sex. Now X has thought out this murder beforehand, but not very long beforehand."
"How do you make that out?" Dr. Ringwood demanded.
"Because the two bits of wood which form the handles of the tourniquet are simply pieces cut off a tree, and freshly cut, by the look of the ends. X must have had possession of these before coming into the house—hence premeditation. But if it had been a case of long premeditation, X would have had something better in the way of handles. I certainly wouldn’t have risked landing on a convenient branch at the last moment if I’d been doing the job myself; and X, I may say, strikes me as a remarkably cool, competent person, as you’ll see."
"Go on," the doctor said, making no attempt to conceal his interest.
"Our friend X probably had the cord in his or her pocket and had constructed the rough tourniquet while coming along the road. Our friend X was wearing gloves, I may say."
"How do you know that?" Ringwood asked.
"You’ll see later. Now X went up to the front door and rang the bell. The maid came along, recognised X. . . ."
"How do you know that? "Ringwood repeated.
"I don’t know it. I’m just giving you the hypothesis you asked for. I don’t say it’s correct. To continue: this person X inquired if Silverdale (or Mrs. Silverdale, perhaps) was at home. Naturally the maid said no. Most likely she told X that her companion had scarlatina. Then X decided to leave a note, and was invited into the house to write it. It was a long note, apparently; and the maid was told to go to the kitchen and wait till X had finished. So off she went."
"Well?"
"X had no intention of putting pen to paper, of course. As soon as the maid was out of the way, X slipped upstairs and switched on the light in this room."
"I’d forgotten it was the light in this window that we saw from the outside," Dr. Ringwood interrupted. "Go on."
"Then, very quietly, by shifting the table on the landing under the electric light, X removed the bulb that lighted the stair. One can reach it by standing on that table. Then X shifted the table back to its place. There were no finger-prints on the bulb—ergo, X must have been wearing gloves, as I told you."
"You seem to have got a lot of details," the doctor admitted. "But why all this manœuvring?"
"You’ll see immediately. I think I said already that whoever did the business was a very cool and competent person. When all was ready, X attracted the maid’s attention in some way. She came to the foot of the stairs, suspecting nothing, but probably wondering what X was doing, wandering about the house. It’s quite likely that X made the sick girl upstairs the pretext for calling and wandering out of bounds. Anyhow, the maid came to the foot of the stairs and moved the switch of the landing light. Nothing happened, of course, since the bulb had been removed. She tried the switch backwards and forwards once or twice most likely, and then she would conclude that the lamp was broken or the fuse gone. Probably she saw the reflection of the light from the room-door. In any case, she came quite unsuspiciously up the stair."
Sir Clinton paused, as though to allow the doctor to raise objections; but none came, so he continued:
"Meanwhile X had taken up a position opposite the door of the room, at the foot of the second flight of stairs. If you remember, a person crouching there in semi-darkness would be concealed from anyone mounting the first flight. The tourniquet was ready, of course."
Dr. Ringwood shuddered slightly. Apparently he found Sir Clinton’s picture a vivid one, in spite of the casual tone in which it had been drawn.
"The girl came up, quite unsuspicious," Sir Clinton continued. "She knew X; it wasn’t a question of a street-loafer or anything of that sort. An attack would be the last thing to cross her mind. And then, in an instant, the attack fell. Probably she turned to go into the lighted room, thinking that X was there; and then the noose would be round her neck, a knee would be in her back and . . ."
With a grim movement, Sir Clinton completed his narrative of the murder more effectively than words could have done.
