Rebecca Mary had caught a spy! And, oh, how she wished that she hadn't. When she turned the key she had felt like Joan of Arc but immediately she became the most arrant little coward that ever was. She leaned against the door and trembled in every inch. She didn't know what to do with her spy now that she had caught him.

Of course, there was but one thing to do. She would have to tell old Peter Simmons and give him the key. And now that she had Frederick Befort locked in Major Martingale's office she was sorry. She had liked Frederick Befort. He was so different from any man she ever had met. He had seemed romance to her with his title, his centuries-old château, his rose-embowered country, his stories of boar hunts and kaisers and grand duchesses, and all sorts of people such as Rebecca Mary had never met on her way to and from the Lincoln school.

But Rebecca Mary had learned a lot of the little grand duchy about which she had known so little, and she knew that while there were many men in Luxembourg who had hated and feared German power there were others who would have welcomed it. Frederick Befort had told her that himself, and she had read it in a book, also. Frederick Befort had been at school in Germany, he had been born and raised almost in Germany; only the width of a river had separated him from Germany. How did they really know whether he actually had come from the Luxembourg side of the River Sure? But whether he was in sympathy with Germany or not he had stolen the secret of the great experiment which Germany wanted. That was the one thing Rebecca Mary was sure of. She had the proof of that.

And if he was a traitor he should suffer only—only—— There was Joan! As she remembered Joan, Rebecca Mary wanted to open the door and plead with Frederick Befort, make him promise to forget all about Germany, to keep faith with old Peter Simmons. If he would do that, if he could make Rebecca Mary trust him again she might—she might—— It would be too horrible for Joan to be labeled the daughter of a spy.

It was so horrible to Rebecca Mary that her hand was on the key when she heard a smothered exclamation and a thud as if a movable body had suddenly come in contact with an immovable body. Rebecca Mary cowered down beside the door and held her breath until the hall was flooded with light, and she raised her frightened eyes and saw Richard Cabot staring at her.

"What are you doing there?" He could not believe that she was listening. Rebecca Mary was not the sort of a girl who would listen at keyholes.

"H-sh!" She waved a frantic beckoning hand to him. She was so glad that it was Richard who had found her. He was so sensible, so dependable, he was Waloo's youngest bank vice-president and so was a man whom many people trusted. She had never appreciated what it meant to be sure she could trust a man before. A little glow broke through the smothering blackness which had enshrouded her as she thought of how she could trust Richard. Rebecca Mary knew that she was quite incapable of handling this situation, but she knew that Richard could handle it. She could not imagine a situation which Richard could not handle. So when Richard asked her with a compelling mixture of curiosity and determination: "What's in there?" she stammered painfully, but she told him. "A leak!"

"A leak?" he repeated stupidly for he had not heard the words Major Martingale and the others were constantly using and which had impressed themselves upon Rebecca Mary's brain. He stared at the hand which clung to the door knob. If there was a leak, although Richard did not see how that could be for there were no pipes in the office to leak, did Rebecca Mary think she could stop it by clinging to the door?

Rebecca Mary put out her other hand and clutched his arm. She had to feel him as well as see him. "I know Major Martingale has been afraid of a leak," she faltered, "and as I was coming down the stairs I saw that this door was open. You know it always has been kept locked." She went on more hurriedly after she had started as if she wished to finish her story as soon as possible. "And I saw a man at Major Martingale's desk. I did! It wasn't my imagination. I really saw him and I shut the door and—and locked it. He hasn't made a sound so he couldn't have heard me. But—but I'm frightened!" And indeed she looked frightened.

Richard frowned, but he put his hands over the fingers on his arm. "Did you see who he was?" he asked quickly in a hushed voice, almost a whisper.