“You had the pleasure of meeting me before that,” said Jennie, speaking without giving thought to what she said.

“Really!” cried the detective, dropping his papers on the table; “and where was that?”

“Oh, well, as you have just said—it has nothing to do with this case. Perhaps I was wrong in saying you saw me; it would be more correct to say that I saw you. You must remember that you are a public character, Mr. Taylor.”

“Ah, quite so,” said the detective complacently, turning to his documents again. “Now, the Princess von Steinheimer was invited to the Duchess of Chiselhurst’s ball, but she did not attend it.”

“Are you sure of that?” said the girl. “I thought her name was among the list of those present.”

“It was in the list, and that is just where our mystery begins. Someone else attended the ball as the Princess von Steinheimer; it is this person that I wish to find.”

“Ah, then you are employed by the Duke of Chiselhurst?”

“No, I am not, for, strangely enough, I believe the Duke thinks it was actually the Princess who attended the ball. Only one man knows that the Princess was not present, one man and two women. Of the latter, one is the Princess von Steinheimer, and the other, the lady who impersonated her. The one man is Lord Donal Stirling, of the Diplomatic Service, whose name is no doubt familiar to you. Lord Donal has done me the honour to place the case in my hands.”

“Why does his lordship wish to find this—this—fraudulent person?” asked Jennie, speaking slowly and with difficulty.

“Because,” said the detective, with the air of a man who knows whereof he speaks, “he is in love with her.”