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 great anarchist, Professor de Worms.' The policeman impassively consulted a paper in his hand, 'No, sir,' he said civilly, 'at least, not exactly, sir. I am arresting you on the charge of not being the celebrated anarchist, Professor de Worms.' This charge, if it was criminal at all, was certainly the lighter of the two, and I went along with the man, doubtful, but not greatly dismayed. I was shown into a number of rooms, and eventually into the presence of a police officer, who explained that a serious campaign had been opened against the centres of anarchy, and that this, my successful masquerade, might be of considerable value to the public safety. He offered me a good salary and this little blue card. Though our conversation was short, he struck me as a man of very massive common sense and humour; but I cannot tell you much about him personally, because——"

Syme laid down his knife and fork.

"I know," he said, "because you talked to him in a dark room."

Professor de Worms nodded and drained his glass.