"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.

They stared with the fascination of horror

"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.

"And look at her dress, those long, full sleeves and the big, bulging skirt! That's different, too. And then her hair, not high and powdered and all fussed up, but low and parted smooth and drawn down over her ears, and that dear little wreath of tiny roses! She almost seems to be going to speak. And, oh, Cynthia, isn't she beautiful with those big, brown eyes! Somehow I feel as if I just loved her—she's such a darling! And I believe she had more to do with the queer things in this house than any of those other dead-and-alive picture-ladies. Tell you what! We'll go to the public library to-morrow and get out a big book on costumes of the different centuries that I saw there once. Then, by looking up this one, we can tell just about what time she lived. What do you say?"

"As usual, you've thought of just the thing to do. I never would have," murmured Cynthia, still gazing at the picture of the lovely lady. Suddenly Joyce started nervously:

"Hush! Do you hear anything? I'm almost certain I heard a sound in the other room!" They both fell to listening intently. Yes, there was a sound, a strange, indefinable one like a soft tiptoeing at long intervals, and even a curious, hoarse breathing. Something was certainly outside in the drawing-room.

"What shall we do?" breathed Cynthia. "We can't get out of here without passing through that room! Oh, Joyce!" They listened again. The sound appeared to be approaching the door. It was, without doubt, a soft tiptoeing step. Suddenly there was the noise of a chair scraping on the floor as if it had been accidentally brushed against. Both girls were now numb with terror. They were caught as in a trap. There was no escape. They could only wait in racking suspense where they were.