There was a large leather chair near the open fireplace, so heavy that it was not easily moved, and which obviously was meant for use as a lounging nest in which one could luxuriate in laziness at the fire. Behind this chair Chick squeezed himself just as the window opened, with a creak, behind the curtains. He was not surprised when the man who came into the room proved to be Professor Tolo. The intruder carried a large pocket flash lamp, and his first action was to throw the light all about the room. Chick squeezed into a still smaller space behind the great chair, ready to hide himself entirely when the light should come his way. Then one of the incandescent lights was switched on, and he saw there was a Chinaman in native dress with the professor. “Stand at the door, Sun Jin,” whispered the professor, in English, to his companion. Without a word, the Chinaman stepped over to the door, saw that there was a key in the door, and turned it in the lock. Chick was glad he had not followed his first impulse, to lock the door when he came in. If he had, it would have told the rascals there was somebody else in the room. Without paying any particular attention to Sun Jin, the professor began to pull from the bookcase the same volumes he had moved in the presence of Nick Carter. Placing them on a chair, he took out several more books. Then Chick heard a clicking sound. “Wonder whether I ought to plug him right now,” thought Chick, fingering the automatic revolver in his coat pocket. “I could wing him, so that he would be helpless, without killing him. Then I could lay out the chink, and----” “Curse him! It isn’t here!” broke out Professor Tolo, in unmistakable English. He had opened a recess at the back of the bookcase, behind the place where the removed volumes had stood, and found that nothing was there. “That’s worth knowing,” thought Chick. “The thing they murdered Mr. Anderton for has got away from them, after all. Now, what will they do? There is one satisfaction I have, and it was worth my coming here to find out--this Tolo is mixed up with the Yellow Tong. I wish----” Professor Tolo had been hastily replacing the books, and now he turned to the Chinaman standing at the door, to say, in a surly tone: “Look out and see if everything is clear.” The Chinaman came from the door, and, as if to make sure there was no one in the room besides himself and the mysterious professor, walked all around it, gazing in every direction. It was well for Chick that he was in deep shadow, or he must have been discovered, for the Chinaman looked all about him, even to placing his hand on the back of the big leather chair. Chick drew back, and was able only just to hide himself. The Chinaman moved on toward the window, without seeing Chick. On the other hand, Chick had had a clear view of the fellow’s face, and as he placed his hand on the automatic pistol in his pocket, he murmured excitedly: