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"I think, Miller," said he, "that I can give you a hint."

"Indeed, sir? And what might that be?"

"It is this: you are after the wrong man."

The superintendent snorted—not a loud snort, for that would have been rude, and no officer could be more polite than Superintendent Miller. But it conveyed a protest which he speedily followed up in words.

"You don't mean to say that the prints on that glass are not the finger-prints of Frank Belfield?"

"I say that those prints were not made by Frank Belfield," Thorndyke replied firmly.

"Do you admit, sir, that the finger-prints on the official form were made by him?"

"I have no doubt that they were."

"Well, sir, Mr. Singleton, of the Finger-print Department, has compared the prints on the glass with those on the form and he says they are identical; and I have examined them and I say they are identical."

"Exactly," said Thorndyke; "and I have examined them and I say they are identical—and that therefore those on the glass cannot have been made by Belfield."

The superintendent snorted again—somewhat louder this time—and gazed at Thorndyke with wrinkled brows.