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46 "That is the invariable description of Mr. Brown! Brought a telephone message to the man Whittington, did he? Notice a telephone in the outer office?"

Tuppence thought.

"No, I don't think I did."

"Exactly. That 'message' was Mr. Brown's way of giving an order to his subordinate. He overheard the whole conversation of course. Was it after that that Whittington handed you over the money, and told you to come the following day?"

Tuppence nodded.

"Yes, undoubtedly the hand of Mr. Brown!" Mr. Carter paused. "Well, there it is, you see what you are pitting yourselves against? Possibly the finest criminal brain of the age. I don't quite like it, you know. You're such young things, both of you. I shouldn't like anything to happen to you."

"It won't," Tuppence assured him positively.

"I'll look after her, sir," said Tommy.

"And I'll look after you," retorted Tuppence, resenting the manly assertion.

"Well, then, look after each other," said Mr. Carter, smiling. "Now let's get back to business. There's something mysterious about this draft treaty that we haven't fathomed yet. We've been threatened with it—in plain and unmistakable terms. The Revolutionary element as good as declare that it's in their hands, and that they intend to produce it at a given moment. On the other hand, they are clearly at fault about many of its provisions. The Government consider it as mere bluff on their part, and, rightly or wrongly, have stuck