Thorndyke noted the statement with a certain grim appreciation. In spite of himself, he could not but like Varney; and this playful, sporting attitude in respect of a capital crime appeared to him as a new experience. It established him and Varney as opposing players in a sort of grim and tragic game, and it confirmed him in certain opinions that he had formed as to the antecedents and motives of the crime. For, as to the reality of the crime he now had no doubt. The statement that Varney had just made in all the insolence of his fancied security had set the keystone on the edifice that Thorndyke had built up. Circumstantial evidence has a cumulative quality. It advances by a sort of geometrical progression in which each new fact multiplies the weight of all the others. The theory that Varney had made away with Purcell involved the assumption that Varney was a lithographer who was able to print. It was now established that Varney was a lithographer and that he owned a press. Thus the train of circumstantial evidence was complete.

It was a most singular situation. In the long pauses which tend to occur when good appetites coincide with a good dinner, the two men, confronting one another across the table, sat, each busy with his thoughts behind the closed shutters of his mind, each covertly observant of the other and each the object of the other’s meditations. To Varney had come once more that queer feeling of power that he had experienced at Sennen when Mr. Penfield’s letter had arrived; the sense of an almost godlike superiority and omniscience. Here were these simple mortals, full of wonder, perplexity and speculation as to the vanished Purcell. And they were all wrong. But he knew everything. And he was the motive power behind all their ineffectual movements. It was he who, by the pressure of a finger, had set this puppet-show in motion; and he had but to tweak a string in his quiet studio and they were all set dancing again. Every one of them was obedient to his touch; Maggie, Penfield, Rodney, even this strong-faced, inscrutable man whose eye he had just met; all of them were the puppets whose movements, joint or separate, were directed by his guiding hand.

Thorndyke’s reflections were more complex. From time to time he glanced at Varney—he was too good an observer to need to stare—profoundly interested in his appearance. No man could look less like a murderer than this typical artist with his refined face, dreamy yet vivacious, and his suave, gentle manners. Yet that, apparently, was what he was. Moreover, he was a forger of banknotes—perhaps of other things, too, as suggested by the very expert production of this letter—and had almost certainly uttered the forged notes. That was, so to speak, the debit side of his moral account; and there was no denying that it was a pretty heavy one.

On the other hand, he was evidently making a serious effort to earn an honest living. His steady industry was clear proof of that. It was totally unlike a genuine criminal to work hard and with enthusiasm for a modest income. Yet that was what he was evidently doing. It was a very singular contradiction. His present mode of life, which was evidently adapted to his temperament, seemed totally irreconcilable with his lurid past. There seemed to be two Varneys; the criminal Varney, practising felonies and not stopping short of murder, and the industrious, artistic Varney, absorbed in his art and content with the modest returns that it yielded.

Which of them was the real Varney? As he debated this question, Thorndyke turned to the consideration of the other partner in the criminal firm. And this seemed to throw an appreciable light on the question. Purcell had clearly been the senior partner. The initiative must have been his. The starting-point of the banknote adventure must have been the theft of the note-moulds at Maidstone. That had been Purcell’s exploit; probably a lucky chance of which he had taken instant advantage. But the moulds were of no use to him without an engraver, so he had enlisted Varney’s help. Now, to what extent had that help been willingly given?

It was, of course, impossible to say. But it was possible to form a reasonable opinion by considering the characters of the two men. On the one hand, Varney, a gentle, amiable, probably pliable man. On the other, Purcell, a strong, masterful bully; brutal, selfish, unscrupulous; ready to trample ruthlessly on any rights or interests that conflicted with his own desires. That was, in effect, the picture of him that his wife had painted—the wife whom he had married, apparently against her inclination, by putting pressure on her father who was his debtor. Purcell was a money-lender, a usurer; and even at that, a hard case, as Mr. Levy’s observations seemed to hint. Now a usurer has certain affinities with a blackmailer. Their methods are somewhat similar. Both tend to fasten on their victim and bleed him continuously. Both act by getting a hold on the victim and putting on the screw when necessary; and both are characterized by a remorseless egoism.

Now Purcell was clearly of the stuff of which blackmailers are made. Was it possible that there was an element of blackmail in his relations with Varney? The appearances strongly suggested it. Here were two men jointly engaged in habitual crime. Suddenly one of them is eliminated by the act of the other; and forthwith the survivor rids himself of the means of repeating the crime and settles down to a life of lawful industry. That was what had happened. The instant Varney had got rid of Purcell, he had proceeded to get rid of the paper blanks by sending them to Mr. Penfield, instead of printing them and turning them into money; and by thus denouncing the firm, had made it impossible, in any case, to continue the frauds. Then he had settled down to regular work in his studio. That seemed to be the course of events.

It was extremely suggestive. Purcell’s disappearance coincided with the end of the criminal adventure and the beginning of a reputable mode of life. That seemed to supply the motive for the murder—if it had been a murder. It suggested that no escape from the life of crime had been possible so long as Purcell was alive; that Purcell had obtained some kind of hold on Varney which enabled him to compel the latter to continue in the criminal partnership; and that Varney had taken the only means that were possible to rid himself of his parasite. That was what it looked like.

Of course this was mere guess-work. No proof was possible. But it agreed with all the facts and it made Varney’s apparent dual personality understandable. The real and essential Varney appeared to be the artist, not the criminal. He appeared to be a normal man who had committed a murder under exceptional circumstances. With the bank-note business Thorndyke was not concerned and he had no knowledge of its circumstances. But the murder was his concern and he set himself to consider it.

The hypothesis was that Purcell had been, in effect, a blackmailer and that Varney had been his victim. Now, it must be admitted that Thorndyke held somewhat unconventional views on the subject of blackmail. He considered that a blackmailer acts entirely at his own risk and that the victim (since the law can afford him but a very imperfect protection) is entitled to take any available measures for his own protection, including the elimination of the blackmailer. But if the blackmailer acts at his own risk, so does the victim who elects to make away with him. Morally, the killing of a blackmailer may be justifiable homicide, but it has no such legal status. In law, self-defence means defence against bodily injury, it does not include defence against moral injury. Whoever elects to rid himself of a blackmailer by killing him accepts the risk of a conviction on a charge of murder. But that appeared to be Varney’s position. He had accepted the risk. It was for him to avoid the consequences if he could. As to Thorndyke, himself, though he might, like the Clerk of Arraigns at the Old Bailey, wish the offender “a good deliverance,” his part was to lay bare the hidden facts. He and Varney were players on opposite sides. He would play impersonally, without malice and with a certain good will to his opponent. But he must play his own hand and leave his opponent to do the same.