"Now, Mr. Dawson," said I. "Perhaps you will tell me to what happy circumstance I owe the honour of this visit?"
He had been chuckling over certain rich details in the Hagan chase—with an eye, no doubt, to future enlarged editions—but these words of mine pulled him up short. Instantly he became grave, drew some papers from his pocket, and addressed himself to business.
"I have come to you, Mr. Copplestone, as I did to your friend Mr. Cary, for information and assistance, and I have been advised by those who know you here to be perfectly frank. You are not at present an object of suspicion to the local police, who assure me, that though you are known to have access to much secret information, yet that you have never made any wrongful use of it. You have, moreover, been of great assistance on many occasions both to the military and naval authorities. Therefore, though my instinct would be to lock you up most securely, I am told that I mustn't do it."
"You are very frank," said I. "But I bear no malice. Ask me what you please, and I will do my best to answer fully."
"I ought to warn you," said he, with obvious reluctance, "that anything which you say may, at some future time, be used in evidence against you."
"I will take the risk, Mr. Dawson," cried I, laughing. "You have done your duty in warning me, and you are so plainly hopeful that I shall incriminate myself that it would be cruel to disappoint you. Let us get on with the inquisition."
"You are aware, Mr. Copplestone, that a most important part of my work consists in stopping the channels through which information of what is going on in our shipyards and munition shops may get through to the enemy. We can't prevent his agents from getting information—that is always possible to those with unlimited command of money, for there are always swine among workmen, and among higher folk than workmen, who can be bought. You may take it as certain that little of importance is done or projected in this country of which enemy agents do not know. But their difficulty is to get it through to their paymasters, within the limit of time during which the information is useful. There are scores of possible channels, and it is up to us to watch them all. You have already shown some grasp of our methods, which in a sentence may be described as unsleeping vigilance. Once we know the identity of an enemy agent, he ceases to be of any use to the enemy, but becomes of the greatest value to us. Our motto is: Ab hoste doceri." He pronounced the infinitive verb as if it rhymed with glossary.
"You are quite a scholar, Mr. Dawson," remarked I politely.
"Yes," said he, simply. "I had a good schooling. I need not go into details," he went on, "of how we watch the correspondence of suspected persons, but you may be interested to learn that during the three weeks which I have passed in your city all your private letters have been through my hands."
"The devil they have," I cried angrily. "You exceed your powers. This is really intolerable."