"Think well, it is a very important point. For instance, has she ever given you any keepsake, a glove, a handkerchief, something—some trifle she was wearing at a dance when—when you flirted with her? Girls do that kind of thing, so my niece there has told me."

Zena smiled and made no denial.

"Nothing of the kind has happened between Mademoiselle and myself," said Lanning.

"And yet there seems to be a distinct attempt on some one's part to implicate you."

"That is true, and I am quite at a loss to understand it."

"I have wondered whether it is not a clever device to put us off the trail," said Nixon. "Your investigations may have led you nearer the truth than you imagined, Mr. Quarles, and this may be an attempt to set you off on a wrong scent. It seems such an obvious clue, doesn't it? They would guess that Lanning would communicate with you."

"That hardly explains why they went to Mademoiselle Duplaix, does it?"

"But the fact that she is French may," Nixon answered. "Perhaps I am prejudiced, but I believe Silesia has pulled the strings of this affair, and that would be a very good reason for trying to implicate France. It has occurred to Lanning whether the plot might not be frustrated at the other end of it, so to speak. Lanning thinks it would be a good idea if we went to Silesia."

"What do you think of the idea?" Lanning asked. "I should have our Embassy there behind me, and I should probably manage to get in touch with the men who are active in Silesia's secret service. I mentioned it to my chief this morning, and he thought there was a great deal in it, but advised a consultation with you first."

"I think it is a good idea," said Quarles, "and it suggests another one. I am still a little doubtful about Mademoiselle Duplaix, and I have a strong impression that she could at least tell us more if she would, but that she is afraid of hurting you."