“In the first place,” he replied, “I inferred that he looked on her as a dangerous person who might have some knowledge of his transactions with her father. This was probably the explanation of his attempt when he cut the brake-wire of her bicycle. But the second, more desperate attack, was made, I assume, when he had realized the existence of the plaster mask, and supposed that she knew of it, too. If he had killed her, he would probably have made another search with the studio fully lighted up.

“To return to our inquiry. You see that I had a mass of hypothesis but not a single real fact. But I still had a firm belief that a wax mask had been made and that—if it had not been destroyed—there must be a plaster mask somewhere in the studio. That was what I came to look for that morning; and as it happens that I am some six inches taller than Bendelow was, I was able to see what had been invisible to him. When I discovered that mask, and when Marion had disclaimed all knowledge of it, my hopes began to rise. But when you identified the face as that of Morris, I felt that our problem was solved. In an instant, my card-house of speculative hypothesis was changed into a solid edifice. What had been but bare possibilities had now become so highly probable that they were almost certainties.

“Let us consider what the finding of this mask proved—subject, of course, to verification. It proved that a wax mask of Morris had been made—for here was the matrix, varnished, as you will remember, in readiness for the gelatine mould; and that mask was obviously obtained for the purpose of a fraudulent cremation. And that mask was made by Julius D’Arblay.

“What was the purpose of the fraud? It was perfectly obvious. Morris was clearly the real Simon Bendelow, and the purpose of the fraud was to create undeniable evidence that he was dead. But why did he want to prove that he was dead? Well, we knew that he was the murderer of Van Zellen, for whom the American police were searching, and he might be in more danger than we knew. At any rate, a death certificate would make him absolutely secure—on one condition—that the body was cremated. Mere burial would not be enough; for an exhumation would discover the fraud. But perfect security could be secured only by destruction of all evidence of the fraud. Julius D’Arblay held such evidence. Therefore Julius D’Arblay must be got rid of. Here, then, was an amply sufficient motive for the murder. The only point which remained obscure was the identity of your patient, and the means by which his disappearance had been accounted for.

“My hypothesis, then, had been changed into highly probable theory. The next stage was the necessary verification. I began with a rather curious experiment. The man who tried to murder Marion could have been no other than her father’s murderer. Then he must have been Morris. But it seemed that he was totally unlike Morris, and the mask evidently suggested to her no resemblance. But yet it was probable that the man was Morris, for the striking features—the hook nose and the heavy brows—would be easily ‘made up,’ especially at night. The question was whether the face was Morris’s with these additions. I determined to put that question to the test. And here Polton’s new accomplishment came to our aid.

“First, with a pinch of clay, we built up on Morris’s mask a nose of the shape described and slightly thickened the brows. Then Polton made a gelatine mould, and from this produced a wax mask. He fitted it with glass eyes and attached it to a rough plaster head, with ears which were casts of my own painted. We then fixed on a moustache, beard, and wig, and put on a shirt, collar, and jacket. It was an extraordinarily crude affair, suggestive of the fifth of November. But it answered the purpose, which was to produce a photograph; for we made the photograph so bad—so confused and ill-focussed—that the crudities disappeared, while the essential likeness remained. As you know, that photograph was instantly recognized, without any sort of suggestion. So the first test gave a positive result. Marion’s assailant was pretty certainly Morris.”

“I should like to have seen Mr. Polton’s ’prentice effort,” said Marion, who had been listening, enthralled by this description.

“You shall see it now,” Thorndyke replied with a smile. “It is in the next room, concealed in a cupboard.”

He went out, and presently returned, carrying what looked like an excessively crude hairdresser’s dummy, but a most extraordinarily horrible and repulsive one. As he turned the face towards us, Marion gave a little cry of horror and then tried to laugh—without very striking success.

“It is a dreadful-looking thing!” she exclaimed; “and so hideously like that fiend.” She gazed at it with the most extreme repugnance for a while, and then said, apologetically: “I hope you won’t think me very silly, but⸺”