As I pushed back my chair, both men looked at me in surprise. In a few words I told where I was going, and Bartley at once suggested that he would go with us, to which the Englishman added his assent. We found our hats, went out on the lawn and, finding the Airedale running back and forth, locked him in the garage. The next moment we were in the car and a second later drove out of the yard. Chapter X The Face at the Window As we went up the hill which led to the eight-sided building in which we had found the murdered scientist, we concluded the chief had arrived. The lights were streaming out of the windows and the front door was slightly open. As we passed within the chief came over from the desk in the center of the room. I introduced him to Bartley and he shook his hand with evident pleasure. For a few moments the two men talked. The chief told us the room was untouched from the night of the crime. After we had left he had stationed one of his policemen in the library. He said that he did not want the place overrun with people, and he knew that until the secretary had been found there was no way for him to tell if anything was missing. The room had not been entered by any one, though there had been hundreds of people drawn by curiosity who had wished to look within. Bartley's eyes swept around the book-lined walls and then came to rest on the big desk in the center of the room. I told him where we had found the body and he slowly walked over to the place I pointed out. The chairs were just as we had found them and I mentioned what Ranville had said regarding the murderer sitting across from Warren. He slowly nodded his head in approval and then, turning, his keen eyes saw the broken glass in the bookcase. I told him we had found it in that condition; and he went over to the case and, bending down, looked at the contents. Pulling first one and then another of the thin books from the case, he glanced at their title page, only to return them to the shelf. He spent some little time at the row which had the gaps in it, and I saw him half frown as he looked at every book on that shelf. He was just starting to say something when a voice from the door called: “I hope I have not kept you waiting.” We turned to see the secretary coming across the floor. She had changed her light dress for one of some darker material, and her face was very serious. As she cast a glance at the desk, I saw her shudder, and her cheeks grew a little pale. But there was nothing of fear in the frank glance she gave the chief and the rather curious look which went over Bartley and Ranville. The chief introduced her to the two men, and in a few words told them what she had said had been the reason she left her work so suddenly. When he had finished her face flushed as she spoke: