Jean did not leave the cozy corner until she was sure Marjorie had joined the dancers. She leaned back against the pillows, faint with astonishment and dismay. What should she do? One idea after another rushed through her brain and confused her more and more. She must act quickly, or it would be too late. Stealing into the outer hall she found the black robe and mask Jack had left there and she put them on over her Old Mother Hubbard costume. She knew she was not as tall as Jack was, but still there was not such a great difference and it was worth the risk. Slowly wending her way back into the main room, she found the sister of charity just about to dance with a Little Boy Blue. She put her arm round Marjorie and drew her away before Little Boy Blue realized what was happening. Marjorie herself was so astonished she could say nothing at first, but after a moment whispered, "Jack, how careless; you must go. We're going to unmask after this dance and if you're found here I'll be expelled to-morrow." But the monk answered never a word, but danced as smoothly and gently as though he had heard nothing. Again Marjorie whispered, "Oh, Jack, you must go! Don't wait another minute or I'm lost." Just then the music stopped and some one cried, "Masks off!" and there was a general pulling off of masks amid peals of laughter. As Marjorie gazed into Jean's face a look of terror settled over her own as she gasped "You!" but Jean said quietly, "We'll talk about it later up in your room. Don't leave until the others do," and she hurried away. There were many surprises at the unmasking, but the greatest was Jean's. Several of the girls, among them Elizabeth and Sallie, declared they had recognized her earlier in the evening in another costume, but she refused to answer except as she whispered in Elizabeth's ear, "Don't ask too many questions. Trust me; it's all right." Then the refreshments were served and still there was time for a few more dances. Jean went to the piano and offered to play so that the pianist might dance a little. Really, Jean needed to think and be away from the girls. She hardly knew what she was playing, so absorbed was she with the thought of what Marjorie had done and what she as proctor of fourth floor must do before very long. Such a thing could not be passed by unnoticed, and still what a terrible thing it would be to have Marjorie expelled through her. She had heard of people sacrificing duty for friendship, and she wondered what she would do when it came time to decide. Once the room seemed to grow black and she thought she would fall off the stool, but by a supreme effort she shook off the approaching faintness and finished the waltz she was playing. Then she arose and left the piano and walked over to Mrs. Thompson. "I think I will be excused, if you please, Mrs. Thompson. I feel a little tired. It's been a splendid party. Good night."