Irene went up to bed that night in her usual spirits. She longed for the moment when she could, as usual, kiss little Agnes; but she was extra tired, for she had passed a stimulating day, and had been on her best behavior. She felt quite happy, and wondered if her mother, when her allotted time at the Merrimans' was over, would send her and little Agnes and Rosamund to another school somewhere else. She liked the excitement of school-life, and thought that if she could find a home where there was no girl like Lucy she would be perfectly happy. She little knew that in all schools there are girls of the Lucy type, who are not amiable, whose faults are far worse than those of ordinary wildness or even ordinary disobedience. But on this occasion she felt almost kindly toward Lucy, who nodded to her and said, "You and Agnes must make the most of yourselves together, for you will miss Rosamund."

"Oh! we'll be quite happy together," said Irene, with a careless nod; and then she went up to her room, opened the door gently, shut it quietly behind her, and shading the candle with one hand, went over to little Agnes's bed.

There was no Agnes there. But a huge hedgehog had curled itself up in a ball close to the pillow where the little delicate head had been pressed. Irene was afraid of no living creature, and she recognized the hedgehog at once. She took it up and laid it on the window-sill. Then she looked round her. Her face was white as death; her teeth chattered. She suddenly left the room and went straight to Lucy's. She opened the door without knocking.

"Lucy!" she said.

"What is it?" said Lucy, who was brushing out her long fair hair.

"Did you put a hedgehog into Agnes's bed?"

"Certainly not," said Lucy.

"Well, some one did as a trick, and the child isn't there."

"The child isn't there? There's only one person who could do that sort of thing, and that is yourself, as you know very well," said Lucy. "But is the child nowhere in the room?"

"You come and look for her, will you?" said Irene. Her tone and manner had completely altered. She was forcing herself to use self-control. Had Fuzz and Buzz, and Thunder and Lightning, and the Stars been present at that moment, there is not the least doubt that Irene would have elected them to wreak their vengeance on Lucy; but she was keeping herself in for all she was worth at the present moment, for after all even Lucy did not much matter—it was little Agnes who mattered.

"Here's the hedgehog," said Irene when they entered her bedroom—"a great big one—and some one had put it into the little one's bed, and she's not there, and you know how timid she is. Where is she? You know I didn't do it. Is it likely I'd do it to one I love?"

"Oh! you're a sort of fairy—a changeling," said Lucy. "And you have done such things to other people. Why shouldn't you do it to her? Anyhow, who else in the house can be accused? Every one knows your character."

"Never mind about my character now. I know, I am positive, that you are at the bottom of this. But the thing is to find little Agnes. I must go at once to Mrs. Merriman."

"I wonder where she can be?" said Lucy, who had not expected for a moment that little Agnes would disappear. "She must have gone to one of the other girls' rooms. We will go to all the others and find out. Of course, I am sorry for you, Irene; but really you went too far when you made use of a hedgehog—such a horrid, frightening thing."

"I don't want your help. I'll go myself," said Irene.

She pushed past Lucy, and going down the corridor, entered each room. Each girl was asked where little Agnes Frost was. Each girl replied that she did not know. It was Phyllis Flower, however, who, in excitement and pallor, started from an uneasy dream.

"Little Agnes?" she said. "But she can't have gone out!"

"It seems to me you know something about this. Will you help me to find her?" said Irene.

Then, all in a minute, for some reason which she could never define, little Phyllis sprang to her feet hastily, put on her clothes, and without even glancing at Lucy, took Irene's hand.

"We'll search the house first," she said.

"Then you don't think I did such a cruel thing?" said Irene.

"Oh, don't ask me! I mean—oh, no, no! But I'll help you to find her. I'll do my best—my very best."

The whole house was awakened, and the alarm given. The Professor was not yet in bed. He was very much worried and annoyed. He directly told Irene that he believed she was guilty of giving her little companion a fright.

"You have done it so often before, you know," he said, "that people certainly do suspect you."

"Suspect me or not as you please," she answered, "but let us find little Agnes. The night is cold; there is sleet falling outside. It will turn to snow before morning. Where is the child? After all," she continued, speaking more like a grown woman than the wild sort of creature that she had been a few months ago, "she is under your charge, Professor Merriman, and you are bound to do your utmost to find her."

But nowhere in the house—not even in the cellars, which Lucy as a last resort suggested might possibly be her hiding-place—could little Agnes be found. At last a regular outdoor search was instituted. Lucy was now really frightened, although she would not own this feeling even to herself.

"Silly, tiresome child!" she kept muttering to herself.

As to Irene, not a single word passed her lips. Suddenly, in the midst of the searchers, she was missing. People wondered where she had gone to. Irene had rushed back to her own room, the room where she and little Agnes had been so happy together. She looked at the little white bed where they had lain in each other's arms. All her past, so cruel, so thoughtless, so selfish, was borne in upon her. She dropped on her knees, and in an agony of terror said aloud, "O God, help me to find her, and to be a good girl in future."

Then Irene felt a wonderful sense of calm. She went down again through the house. No one noticed her, for every one was in a great state of alarm. Those girls who were in bed were desired not to get up; but a good many had disobeyed orders, and Miss Archer, Mademoiselle Omont (gesticulating wildly), Professor Merriman, his wife, the servants, and the older girls were all searching in vain for Agnes. They were calling her name, but no one thought of the bower at the far end of the shrubbery; for what child would be likely to take refuge there?

Irene, however, all of a sudden remembered it. She remembered the night long ago when she, a wild little untamed creature, had crept into the room where Rosamund slept, had forced her to come out with her, and they had spent the night together in the bower. She would go there now. She did not know what guided her footsteps, but she felt sure some one did.

Now, the shrubbery, a delightful place in warm weather, was damp and cold as ice at this time of the year. The leaves, now falling thickly from the trees, lay sodden on the ground. Sleet continued to fall heavily from the sky. All the seekers were chilled to the very bone, and the bower, so charming in summer, so perfect a resort, so happy a hiding-place, was now the very essence of desolation. But Irene cared nothing for that. She cared nothing for the fact that her thin shoes were soaked through and through, that her dress hung closely round her, that her hat was bent forward over her eyes. She only wanted to find little Agnes, and to have her love again. In the bower Irene did find the child crouched up in one corner, terrified, an almost unseeing expression in her eyes. Irene rushed to her with a glad cry.

"My darling! my darling! Oh, my own sweet little darling, come to your own Irene!"

But Agnes gave a shriek of terror when she saw her.

"No, no! Keep away! It's you who did it! You don't love me! No, no, I won't come to you!"

The piercing shrieks that came from the poor little girl's lips brought the rest of the party to the scene. When they appeared, Professor Merriman holding a lantern, they saw Agnes crouched in the farthest corner of the bower, her eyes semi-conscious, her face deadly white with terror, while Irene stood a little way off.

"Some one has turned her brain. Take her; do what you can with her," said Irene; and she walked away, not caring where she went.

They brought little Agnes back, and of course they sent for the doctor. The doctor stayed all night, for he said the child had received some very severe and terrible shock. Mrs. Merriman nursed her, and the next day, as soon as possible, Miss Frost returned.

But neither Miss Frost, nor the doctor, nor any one else could ease the terrors which had laid hold of the brain of little Agnes. She believed Miss Frost to be a sort of magnified Irene. The very name of Irene was enough to set her screaming again. She called Irene a fairy, a changeling, and nothing could soothe her or comfort her.

At last one day the doctor spoke to Mrs. Merriman.

"The case is quite a serious one," he said. "I cannot imagine what has happened to the child. You ought to find out who put that hedgehog in her bed. Hedgehogs are quite harmless in their way; but they would give a timid child a very nasty fright, which she evidently got."

"What we fear is that Irene did it. She has done all sorts of tricks of that kind before now. You remember how poor Miss Frost went to you on a certain occasion."

"Alas! that is true. But compared to this, her sin against poor Miss Frost was innocence itself. Such a timid, gentle, confiding little creature as this! And then report says that she was so devoted to Irene, and that Irene was so changed."

Yes, indeed, Irene was changed, and the great change lay now in the fact that she did not say a word or admit her suffering to any one; but sat moody and silent, scarcely attending to her lessons, indifferent to bad marks, without the least vestige of spirit, with no desire to injure any one. Even Lucy could not provoke a retort from her lips. Whenever she was allowed to, she stole outside little Agnes's door to listen to her mutterings, and to wonder and wonder if the child was to die.

"If she dies I shall go mad," thought the miserable girl, "for she has not only been frightened, but she has been turned against me. Who could have done it?"

Miss Frost had returned; Rosamund had also come back (her father was better); but the key to the mystery was still missing. Irene declared positively to Rosamund that she had nothing to do with the fright that little Agnes had received; but no one could explain how the hedgehog had got into the child's bed. Some one suggested that it had crawled in by itself, but this was repudiated as absolutely im............