"These points, however, were of secondary importance, merely tending to shake slightly what lawyers term the probability of the case against Penreath. But a point of more importance was my discovery that the candle-grease dropped on the carpet was of two different kinds—wax and tallow—suggesting that two different persons were in the room on the night of the murder. Mr. Glenthorpe did not use a candle, but a reading lamp. Neither did Mr. Glenthorpe use the gas globe in the middle of the room. Yet that gas tap was turned on slightly when we examined the room, and the globe and the incandescent burner smashed. Who turned on the tap, and who smashed the globe? Penreath is not tall enough to have struck it with his head. Superintendent Galloway's theory was that it might have been done by the murderer when throwing the body of his victim over his shoulder.

"An ideal case of circumstantial evidence may be weakened, but not destroyed, by the destruction of one or more of the collateral facts which go to make it up. There are two kinds of circumstantial evidence. In one kind presumption of guilt depends on a series of links forming a chain. In the other, the circumstances are woven together like the strands of a rope. That is the ideal case of circumstantial evidence, because the rope still holds when some of the strands are severed. The case against Penreath struck me as resembling a chain, which is no stronger than its weakest link. The strongest link in the chain of circumstances against Penreath was the footprints leading to the pit. They had undoubtedly been made by his boots, but circumstances can lie as well as witnesses, and in both cases the most plausible sometimes prove the greatest liars. Take away the clue of the footprints, and the case against Penreath was snapped in the most vital link. The remaining circumstances in the case against him, though suspicious enough, were open to an alternative explanation. The footprints were the damning fact—the link on which the remaining links of the chain were hung.

"But the elimination of the clue of the footprints did not make the crime any easier of solution. From the moment I set foot in the room it struck me as a deep and baffling mystery, looking at it from the point of view of the police theory or from any other hypothesis. If Penreath had indeed committed the murder, who was the second visitor to the room? And if Penreath had not committed the murder, who had?

"That night, in my room, I sought to construct two alternative theories of the murder. In the first place, I examined the case thoroughly from the police point of view, with Penreath as the murderer. In view of what has come to light since the trial, there is no need to take up time with giving you my reasons for doubting whether Penreath had committed the crime. I explained those reasons to Superintendent Galloway at the time, pointing out, as he will doubtless remember, that the police theory struck me as illogical in some aspects, and far from convincing as a whole. There were too many elements of uncertainty in it, too much guess-work, too much jumping at conclusions. Take one point alone, on which I laid stress at the time. The police theory originally started from the point of Penreath's peculiar behaviour at the Durrington hotel, which, from their point of view, suggested homicidal mania. To my mind, there was no evidence to prove this, although that theory was actually put forth by the defence at Penreath's trial. I witnessed the scene at the breakfast table, and, in my opinion, Sir Henry Durwood acted hastily and wrongly in rushing forward and seizing Penreath. There was nothing in his behaviour that warranted it. He was a little excited, and nothing more, and from what I have heard since he had reason to be excited. Neither at the breakfast table nor in his room subsequently did his actions strike me as the actions of a man of insane, neurotic, or violent temperament. He was simply suffering from nerves. It is important to remember, in recalling the events which led up to this case, that Penreath was invalided out of the Army suffering from shell-shock, and that two nights before the scene at the hotel there was an air raid at Durrington. Shell-shock victims are always prejudicially affected by air raids.

"Even if the police theory had been correct on this point, it seemed inconceivable to me that a man affected with homicidal tendencies would have displayed such cold-blooded caution and cunning in carrying out a murder for gain, as the murderer at the Golden Anchor did. The Crown dropped this point at the trial. I merely mention it now in support of my contention that the case of circumstantial evidence against Penreath was by no means a strong one, because it originally depended, in part, on inferred facts which the premises did not warrant.

"Next, the discoveries made in the room where the murder was committed, and certain other indications found outside, did not fit in with the police case against Penreath. Superintendent Galloway's reconstruction of the crime, after he had seen the body and examined the inn premises, did not account for the existence of all the facts. There were circumstances and clues which were not consistent with the police theory of the murder. The probability of the inference that Penreath was the murderer was not increased by the discoveries we made. I am aware that absolute proof is not essential to conviction in a case of circumstantial evidence, but, on the other hand, to ignore facts which do not accord with a theory is to go to the other extreme, for by so doing you are in danger of excluding the possibility of any alternative theory.

"On the other hand, when I sought to account for the crime by any other hypothesis I found myself puzzled at every turn. The presence of two persons in the room was the baffling factor. The murderer had entered through the window in the storm, lighted the tallow candle which he brought with him, walked straight to the bed and committed the murder. Then he had waited till the rain ceased before carrying the body downstairs to the pit. But what about the second person—the person who had carried the wax candle and dropped spots of grease underneath the broken gas globe? Had he come in at a different time, and why? Why had he sought to light the gas, when he carried a candle? Why had he—as I subsequently ascertained—left the room and gone downstairs to turn on the gas at the meter?

"Eliminating Penreath for the time being, I tried next to fit in the clues I had discovered with two alternative theories. Had the murder been committed from outside by a villager, or by somebody in the inn? There were possibilities about the former theory which I pointed out to Superintendent Galloway, who subsequently investigated them, and declared that there was no ground for the theory that the murder had been committed from outside. The theory that the murder had been committed by somebody inside the inn turned my attention to the inmates of the inn. Excluding Penreath for the time being, there were five inmates inside the walls the night the murder was committed—the innkeeper, his daughter, his mother, the waiter, and Ann, the servant. The girl could hardly have committed the murder, and could certainly not have carried away the body. The old mad woman might have committed the murder if she could have got out of her room, but she could not have carried the body to the pit—neither could the servant. By this process of elimination there remained the landlord and the deaf waiter.

"For a reason which it is not necessary to explain now, my thoughts turned to the waiter when I first saw the body of the murdered man. The possibility that he was the murderer was strengthened by the slight clue of the line in the clay which I found underneath the murdered man's bedroom window. That window is about five feet from the ground outside, and the waiter, who is short and stout, could not have climbed through the window without something to stand on. But the waiter could not possibly have carried the body to the pit. His right arm is malformed, and only a very strong man, with two strong arms, could have performed that feat.

"There remained the innkeeper. He was the only person on the inn premises that night, except Penreath, who could have carried the corpse downstairs and thrown it into the pit. Although thin, I should say he is a man of great physical strength. It is astonishing to think, in looking back over all the circumstances of this extraordinary case, that some suspicion was not diverted to him in the first instance. He was very hard-pressed for money, and he knew for days beforehand that Mr. Glenthorpe was going to draw £300 from the bank—a circumstance that Penreath could not possibly have known when he sought chance shelter at the inn that night. He was the only person in the place tall enough to have smashed the gas globe and incandescent burner in Mr. Glenthorpe's room by striking his head against it. He knew the run of the place and the way to the pit intimately—far better than a stranger like Penreath could. I was struck with that fact when we were examining the footprints. The undeviating course from the inn to the mouth of the pit suggested an intimate acquaintance with the way. The man who carried the body to the pit in the darkness knew every inch of the ground.