“Sorry,” apologized Alington, and then, like the little human bloodhound he was, turned once more to the business of nosing out and developing the finger-prints on the dagger.

“Now,” resumed the major, after ordering O’Shane to have the house and vicinity toothcombed, “let us take up these murders and this assault in logical order and see if we cannot get to the bottom of this mystery. Granted that the evidence may at first appear to point that way, to contend that they were committed by a supernatural agency is absurd. Even if the murderers had some way of making it impossible for their victims to see them, we know that they were either human or animal, or, at least, directed or controlled by human intelligence.

“First of all, we have the death of Max Berjet. This man, it appears, died in the presence of our friend Peret. He hurled himself through that window, had a convulsion, and died. Before he died, however, he told Peret that he had been attacked by ten men. By the way, Peret, what were Berjet’s last words?”

Peret sat hunched in his chair in an abstracted manner, staring into vacancy with knitted brow. He was evidently not pleased by the interruption, and showed his displeasure by scowling at the major.

“Just before Berjet hurled himself through the window,” he explained, ungraciously, “I heard him cry, ‘Help! help! I’m dying!’ As he lay dying on the pavement he gasped, ‘Assassins ... dix!’ just like that. Dix, in the French language, means ‘ten,’ and Berjet was a Frenchman. Figure it out for yourself.”

The major nodded, thoughtfully.

“The words scarcely need any figuring out,” he observed drily. “They seem to figure themselves out. However, in view of the fact that all of the exits were fastened on the inside, and also because there is no evidence to show that any considerable number of men have recently been in this room, I think that we may leave the number of the scientist’s murderers open to question.

“Turning now to the second death, Dr. Sprague appears to have been attacked in the sight of at least two men, our amiable friend Peret and the druggist. Mr. Deweese was attacked at or about the same time that Sprague was, and the attack was also witnessed by the two persons named. Sprague and Deweese struggled with their antagonists, who, from all testimony, appear to have been of immense strength and ferocity.

“Sprague was killed almost instantly, and our friend the artist, after a desperate struggle, was fortunate enough to overcome, or at least to throw off the Thing that had him in its grasp. Deweese, the druggist and Peret declare that they did not see the Thing—that, in short, it was invisible; but both of the former gentlemen testify to the fact that they heard it whisper, and Deweese informs us further that he felt it breathing in his face.

“It seems safe to assume, therefore, that the Thing had substantial form, for even if we have to admit in the face of the facts that the Thing was invisible, we know that it could not have been a supernatural being, since supernatural beings are not supposed to whisper and breathe.”