"At first sight it appears extraordinary, but remember that in the laboratory upstairs we found other snakes. The occupier of the house evidently went in for the reptiles as pets." "I quite agree with you there," he said. "But there are certain circumstances in the case which have aroused my suspicion, old chap. Of all the curious cases I've ever investigated while I've been on the _Comet_, this is the most astounding from every point of view, and I, for one, shan't rest until we've fully solved the problem." "In that you'll have my heartiest assistance," I said. "All the time I can spare away from the office I'll devote to helping you." "Good," Dick exclaimed heartily, refilling his pipe. "Between us we ought to find out something, for you and I can get at the bottom of things as soon as most people." "The two strangest features of this case," I pointed out, "are first the telephonic message, and secondly, the disappearance of the first woman we found." "And those cards!" "And that penny wrapped so carefully in paper!" I added. "Yes, there are fully a dozen extraordinary features connected with the affair. The whole business is an absolute puzzle." "Tell me, old chap," Dick said, after a pause, "what causes you to suspect Patterson?" "I don't suspect him," I answered quickly. "No. I merely think that he has not told the exact truth of the first discovery of the crime, that's all." "Exactly my own opinion," responded Dick. "He's concealing some very important fact from us--for what purpose we can't yet tell. There's more in this than we surmise. Of that I feel absolutely confident." "The snake story is a little too good," I said, rather surprised that his suspicions should have been aroused, for I had not related to him my conversation with Patterson and his very lame excuse for not making a report of the discovery at the police-station. What had aroused Dick's suspicions I was extremely puzzled to know. But he was a shrewd, clever fellow, whose greatest delight was the investigation of crime and the obtaining of those "revelations" which middle-class London so eagerly devours. "A very happy invention of an ingenious mind, my dear fellow," exclaimed the Mystery-monger. "Depend upon it, Patterson, being already aware that there were snakes in that house, invented the story, knowing that when the place was searched it would appear quite circumstantial." "Then you think that he's not in absolute ignorance of who lived there?" I exclaimed, surprised at my friend's startling theory. Dick nodded. "I shouldn't be surprised if it be proved that he knew all along who the dead man is." "Why?" "Well, I noticed that he never once looked at that man's face. It was he who covered it with a handkerchief, as though the sight of the white countenance appalled him." "Come come," I said, "proceed. You'll say that he's the guilty one next."