“I am much obliged to you, Dr. Cassidy,” she said stiffly, “but I much prefer to be on the safe side. We none of us know the secrets of our own hearts, it seems to me. I consider Dr. Witheredge a cruel man, and I have done with him; but he was extremely clever; and I am satisfied that there is something in the science of psycho-analysis.” Tarleton came to my rescue. “The more there is in it the more dangerous it may be in the hands of a clever man without scruples. If you’ll allow me to say so, I think you acted very wisely in deciding to have nothing more to do with Dr. Weathered.” The lady accepted this graciously, and smoothed down her ruffled feathers. I thought I might venture on a fresh question. “Did you know that he was the real proprietor of the Domino Club?” “Never! You don’t say so? I understood it was run by a Frenchwoman--Madame Bonnet.” “You have been there, I suppose?” “Only once. I heard so much about it that I thought I must go and see what it was like. I was there only last Wednesday. But I didn’t stay more than an hour. Dr. Weathell was there, disguised as an Inquisitor, and I was so afraid of his recognizing me that I came away.” There could be no doubt, as far as I could see, that this was the truth. And if it was the truth the lady of the leopard skin and claws was now ruled out of the case. Her part in it had been confined to supplying the poison, or rather in innocently letting it be known where it could be found. To clinch the matter I said: “I wasn’t there, but we heard that a lady had been present who left early. She wore the skin of a leopard, and a necklace of leopard’s claws.” “Yes, that was me; I went as a Leopardess,” our amiable hostess responded with a frankness which put an end to the last doubt. She added in a tone of quiet triumph, “I can see now that that was where my murderous propensities came out. Why else should I have gone as a beast of prey?” I had to admit that she had scored off me. Anything less like a beast of prey or a potential murderess than the bright and birdlike little woman I have never seen. My chief picked out one point that I had overlooked. “Did Weathered mention the Club to you, ma’am? Or did you know this Madame Bonnell?” Mrs. Baker drew herself up. “I didn’t _know_ her,” she said with emphasis. “Such a person is not in my social circle. I knew of her. A friend of mine in Chelsea gave me her card when I went to buy a ticket for the dance, but she was a friend of Madame Bunner’s. It was only a form.” The answer was equally decisive. It seemed clear to me that the only person who could have known of the existence of the poison, and abstracted it, was the man who had perished by it. I saw Tarleton’s watch come out of his pocket, and its slow, steady motion told me that his brain was already at work on the last winding of the mystery.