"You're sure she's a girl with pep, are you? I don't want to bother with any other kind. All right. Tell her to wait for me in the Washington station to-morrow evening at eight. I'll look for her at the right of the information booth. Tell her to wear a red carnation so I'll know her. I'll show her a good time, all right, if she's the right sort. I'll trust you that she's a good looker!" Cameron could not hear the response, but the two were standing silhouetted against a distant light, and something in the attitude of the other man held his attention. For a moment he could not place him, then it flashed across his mind that this was the soldier Chambers, who had been the means of his missing the train at Chester on the memorable occasion when Ruth Macdonald had saved the day. It struck him as a strange thing that these two enemies of his whom he would have supposed to be strangers to one another should be talking thus intimately. To make sure of the man's identity he waited until the two parted and Wainwright went his way, and then at a distance followed the other one until he was quite certain. He walked back thoughtfully trying to make it out. Had Wainwright then been at the bottom of his trouble that day? It began to seem quite possible. And how had Ruth Macdonald happened to be so opportunely present at the right moment? How had she happened to turn down that road, a road that was seldom used by people going to Baltimore? It was all very strange and had never been satisfactorily explained. Ruth had evaded the question most plausibly every time he had brought it up. Could it be that Wainwright had told her of a plot against him and she had reached out to help him? His heart leaped at the thought. Then at once he was sure that Wainwright had never told her, unless perhaps he had told some tale against him, and made him the butt of a great joke. Well, if he had she had cared enough to defend him and help him out without ever giving away the fact that she knew. But here, too, lay a thorn to disturb him. Why had Ruth Macdonald not told him the plain truth if she knew? Was she trying to shield Harry Wainwright? Could she really care for that contemptible scoundrel? The thought in all its phases tore his mind and kept him awake for hours, for the crux of the whole matter was that he was afraid that Ruth Macdonald was going to marry Lieutenant Wainwright, and he knew that it was not only for her sake, but for his also that he did not want this--that it was agony even to contemplate. He told himself, of course, that his interest was utterly unselfish. That she was nothing to him but a friend and never would be, and that while it might be hard to see her belong to some fine man and know he never might be more than a passing friend, still it would not be like seeing her tied to a rotten unprincipled fellow like Wainwright. The queer part of it was that the word "rotten" in connection with his enemy played a great part in his thoughts that night.