"Then, in that case, sir, why don't you?" "Do it? I said in certain circumstances. I have part of a devilish puzzle; the other part is in the hands of a man who may be dead. I hold half of the bank-note; somebody else has the other moiety. Until we can come together, we are both paupers. If I can find that other man, and he has the nerve and the pluck he used to possess, the curse of the Ravenspurs will cease. But, then, I shall never see my friend again." "But you might solve the problem alone." "Impossible. That man and myself made a most hazardous expedition in search of dreadful knowledge. That formula we found. For the purposes of safety, we divided it. And then we were discovered. Of what followed I dare not speak. I dare not even think. "I escaped from my dire peril, but I cannot hope that my comrade was so fortunate. He must be dead. And, without him, I am as powerless as if I knew nothing. I have no proof. Yet I know quite well who is responsible for those murders at Ravenspur." Abell stared at his chief in astonishment. He knew Tchigorsky too well to doubt the evidence of his simple word. The Russian was too strong a man to boast. "You cannot understand," he said. "It is impossible to understand without the inner knowledge that I possess, and even my knowledge is not perfect. Were I to tell the part I know I should be hailed from one end of England to the other as a madman. I should be imprisoned for malignant slander. But if the other man turned up--if only the other man should turn up!" Tchigorsky broke into a rambling reverie again. When he emerged to mundane matters once more he ordered Abell to read the paragraph relating to the latest phase of the tragedy of the lost Ravenspur. "It runs," said Abell, "'Another Strange Affair at Ravenspur Castle. The mystery of this remarkable case still thickens. Late on Wednesday night Mr. Rupert Ravenspur, the head of the family, was awakened by a choking sensation and a total loss of breath. On attempting to leave his bed, the unfortunate gentleman found himself unable to move. "'He states that the room appeared to be filled with a fine spray of some sickly, sweet drug or liquid that seemed to act upon him as chloroform does on a subject with a weak heart. Mr. Ravenspur managed to cry out, but the vapor held him down, and was slowly stifling him----'" "Ah," Tchigorsky cried. "Ah, I thought so. Go on!" His eyes were gleaming; his whole face glistened with excitement. "'Providentially the cry reached the ears of another of the Ravenspurs. This gentleman burst open his father's door, and noticing the peculiar, pungent odor, had the good sense to break a window and admit air into the room. "'This prompt action was the means of saving the life of the victim, and it is all the more remarkable because it was carried out by a Mr. Ralph Ravenspur, a blind gentleman, who had just returned from foreign parts.'"