Miss Moore gave a little, half amused, half sarcastic laugh. "You can't tell? Oh, never mind, my dear. I know you are all right. You weren't doing anything wrong. I expect you were trying to help set matters straight. You don't need to tell me anything. I think I know all that is necessary. Good-bye now. I must get off this car at the corner. Let me tell you, however, not to worry, whatever happens. I am in possession of all the facts, so there will be no trouble in proving them. But if anything disagreeable happens to you," Marjorie Moore gave Bab a reassuring smile, "telephone me, will you? My number is 1607, Union."

Marjorie Moore rushed out of the street car as hurriedly as she had entered it, before Bab could take in what she had said.

Barbara puzzled all the rest of the way home. Could it be possible that Marjorie Moore had discovered Mrs. Wilson's and Peter's plot? Could she also have guessed Harriet's part in it? Bab shuddered, for she remembered the newspaper girl's words to her on the night of their first meeting: "If ever I have a chance to get even with Harriet Hamlin, won't I take my revenge?" Did Marjorie Moore also suspect that an effort would be made to draw Barbara into this whirlpool of disgrace?

No one ate any luncheon at the home of the Assistant Secretary of State, except Mollie and Grace. Fortunately Mr. Hamlin did not return home. Ruth and Bab had decided not to tell the other two "Automobile Girls" of their terrible uneasiness unless they actually needed the help of the younger girls to save the situation. Ruth and Bab did not wish to prejudice Mollie and Grace against Harriet if it were possible to spare her. But Ruth had told Bab that, at four o'clock, Harriet was determined to deliver the papers to Peter Dillon.

At two o'clock, however, the two friends had found no way to influence Harriet to give up her mad project. Indeed, Harriet scarcely spoke to either of them, she was so bitterly angry at what she termed their interference.

At three o'clock, Ruth and Barbara grew desperate. For, at three, Harriet Hamlin closed the door of her bedroom and commenced to dress for her engagement.

"Try once again, Ruth," Bab pleaded. "It is worse even than you know. I believe Marjorie Moore suspects what Harriet is about to do. Suppose she publishes the story in the morning papers. Tell Harriet I have a reason for thinking she knows about the affair."

Bab waited apprehensively for Ruth's return. It seemed to her that, for the first time in their adventures, the "Automobile Girls" had met with a situation that no amount of pluck or effort on their part could control. This was the most important experience of their whole lives, for their country was about to be betrayed! Once Barbara stamped her foot in her impatience. How dared Harriet Hamlin be so willful, so headstrong? Bab's face was white with anxiety and suspense. Her lips twitched nervously. Then in a flash her whole expression changed. The color came back to her cheeks, the light to her eyes. At the eleventh hour the way had been made clear.

Ruth had no such look when she returned to Barbara. She flung herself despondently into a chair. "It's no use," she declared despairingly. "Harriet must go her own way. We can do nothing with her!"

"Yes, we can!" Bab whispered. She leaned over and murmured something in
Ruth's ear.