The question was a direct threat, and Isa Benstein rose to it. She sat there swinging her long arms idly, and glancing with perfect self-possession at her companions. They meant to have that jewel, as she knew; they were not going to stick at anything to gain possession of it. "I have seen it," she said quietly; "in fact, I wore it here on my forehead to-night." Frobisher started. He fairly beamed with admiration. What a woman! What a nerve! he thought. Anybody else would have denied the thing point blank. But here was a woman prepared for any emergency. There was going to be a battle of wits here, and Frobisher rose to the fray. "Surely a rash thing to do," he murmured. "Wasn’t it?" Isa Benstein asked with a swift and glorious smile. "But ignorance is bliss, you say. That being so, there ought to be a great deal more happiness in the world than there is. Count Lefroy, won’t you sit down? No, in that other chair, so that I can see your face." Lefroy bowed and complied. All this waste of time annoyed him, but Frobisher, on the other hand, was enjoying himself exceedingly. Nothing that was straight or open ever appealed to him. He would rather have obtained a shilling by crooked means than a sovereign by holding out his hand for it. "You came here wearing the Blue Stone without knowing it?" he asked. "I am interested, fascinated, and amazed. Incidentally, I am a little amused into the bargain." "Possibly," Isa Benstein smiled brilliantly. "But you are not half so amused as I am." Frobisher grinned at the way in which his challenge had been flaunted back into his teeth. With the quick subtlety of the polyglot the woman had grasped his scheme and what he wanted. "It is good to feel that my guests are thoroughly enjoying themselves," he said politely. "I should like to know how the Blue Stone came into your possession at all." "Problems seem to be in the air," Isa Benstein murmured. "Your flattering interest is very soothing to my vanity. You know what a conjurer means when he speaks of forcing a card on a spectator? Of course you do. The expert with his quickness and his patter can make the spectator he selects draw any card he chooses. The conjurer in this case chose me to force his card upon. But all the same when I came here I had no notion that I was wearing anything half so historic as the Blue Stone of Ghan." "But you tound it out after you got here?" Frobisher said keenly. "Yes. That was a piece of good luck. And when I did so I removed it. That was a piece of caution." "Then you had worked it all out in your mind, I suppose?" "Yes. I worked it out in the best possible way—backwards. I worked it out so completely that I was in a position to read another person’s mind. Shall I read that other person’s mind?"