"Do you see that big chair with its back close to the mantel?" she exclaimed. "I've been wondering why it stands in that position with its back to the fireplace. There was a fire there. You can tell by the ashes and that half-burned log. Well, don't you see? Some one pulled that chair close to the mantel, stepped on it, and turned the picture face to the wall. Now, I wonder why!" "But look here!" cried Cynthia. "If some one else stood up there and turned the picture around, why couldn't we do the same? We could turn it back after we'd seen it, couldn't we?" Joyce thought it over a moment. "I'll tell you, Cynthia (and I suppose you'll think me queer!), there are two reasons why I'd rather not do it right now. In the first place, that silk cord it's hanging by may be awfully rotten after all these years, and if we touch it, the whole thing may fall. And then, somehow, I sort of like to keep the mystery about that picture till a little later,--till we've seen the rest of the house and begun 'putting two and two together.' Wouldn't you?" Cynthia agreed, as she was usually likely to do, and Joyce added: "Now let's see what's in this next room. I think it must be a library. The door of it opens right into this." Bent on further discovery, they opened the closed door carefully. It was, as Joyce had guessed, a library. Book-shelves completely filled three sides of the room. A long library table with an old-fashioned reading-lamp stood in the middle. The fourth side of the room was practically devoted to another huge fireplace, and over the mantel hung another portrait. It was of a beautiful young woman, and before it the girls stopped, fascinated, to gaze a long while. There was little or nothing in this room to indicate that any strange happening had transpired here. A few books were strewn about as though they had been pulled out and thrown down hastily, but that was all. The one thing that attracted most strongly was the portrait of the beautiful woman--she seemed scarcely more than a girl--over the fireplace. The two explorers turned to gaze at it afresh. "There's one thing I've noticed about it that's different from the others," said Joyce, thoughtfully. "It's fresher and more--more modern than the rest of the portraits in the drawing-room and hall. Don't you think so?" Cynthia did.