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 not only because it was as unlikely as any place on earth to be suspected as a channel of spy codes, but also because he had your confidence and could drop in frequently without arousing surprise. The first time Metzger came here happened to be the night I dined with you, as you remember."

Roger nodded. "He asked for the book, and to my surprise, it wasn't there."

"No: for the excellent reason that Weintraub had taken it some days before, to measure it so he could build his infernal machine to fit, and also to have it rebound. He needed the original binding as a case for his bomb. The following night, as you told me, it came back. He brought it himself, having provided himself with a key to your front door."

"It was gone again on Thursday night, when the Corn Cob Club met here," said Mr. Chapman.

"Yes, that time Metzger had taken it," said Aubrey. "He misunderstood his instructions, and thought he was to steal the book. You see, owing to the absence of their third man, they were working at cross purposes. Metzger, I think, was only intended to get his information out of the book, and leave it where it was. At any rate, he was puzzled, and inserted that ad in the Times the next morning—that LOST ad, you remember. By that, I imagine, he intended to convey the idea