"As a result of today's inquiries," Shagarach folded his arms, "two desirable witnesses are missing. The peddler, as I surmised, is not a peddler; and the incendiary, who could assist us materially in our researches, still remains in the Arnold mansion."

Emily's face was puzzled at this enigmatic opening.

"That is to say, he was not seen by any one coming out. I believe, however, that he succeeded in getting away unobserved, as I think I had the pleasure of meeting him this afternoon."

"The incendiary?" cried Emily, and the marshal echoed her.

"At the county jail."

Emily's heart fluttered. Had Shagarach become a convert to the belief in Robert's guilt? And if so?

"You know Harry Arnold?" he asked.

"I have never met him." She colored a little, for she was not descended from the Brewsters of Lynn. "But it seems to me your argument against him is inferential, Mr. Shagarach." Twenty times she had gone over it on her pillow the night before.

"Were the a priori case against Mr. Floyd as strong, you would have more reason than you have to be apprehensive, Miss Barlow," said Shagarach, in that ringing tone of his, from which all the sap of emotion seemed purposely wrung out, leaving only a residuum of dry logic.

Immediately he began writing a letter, as if to terminate the interview, and John Davidson reached for his hat, casting a glance down at his carriage in the street. Then with an effort Emily unburdened herself of the portentous message which she had come to deliver.