Captain Statham stared at the sign, entranced.

“A soldier,” Onslow remarked with his slow smile, “can always distinguish blood from red ink—is it not so?” Statham nodded. “Remember, then, those crossed daggers with the figures in blood are the only genuine mark. All others are forgeries—reject them unhesitatingly. Let me show it you again.” He produced from his pocket-book a paper with the design in the corner, which, when compared with the one on the table, corresponded exactly.

“I warn you,” Onslow added, “because the existence of this ‘No. 101’ is becoming known to the French—they suspect treachery—their Secret Service is clever and they may attempt to deceive you. As they do not know the countersign, though they may have guessed at the treachery of ‘No. 101’ they cannot really hoodwink you. Cipher papers which come in the name of ‘101’ without that remarkable signature are simply a nom de guerre, of politics, of love, of anything you like, but they are either a forgery or a trap; so put them in the fire.”

Statham sat pondering, his eyes riveted on the crossed daggers.

Statham sat pondering, his eyes riveted on the crossed daggers. “You, sir,” he began, “have had dealings with this mysterious person. Is it a man or a woman?”

“Ah!” Onslow laughed gently. “Every one asks that, every man at least. I cannot answer; no one, indeed, can. My opinion? Well, I change it every month. But these are the facts: It is absolutely certain that the traitor insists on high, very high pay; absolutely certain that he or she has access to the very best society in Paris and at the Court, and is at home in the most confidential circles of the King and his ministers. We have even had documents from the private cabinet of Louis XV. Furthermore, the traitor can convey the information in such a way as to baffle detection. If it is a woman she is a very remarkable one; if it be a man he is one who controls important women. Perhaps it is both. Such knowledge, so peculiar, so accurate, so extensive, such skill and such ingenuity scarcely seem to be within the powers of any individual man or woman.”

“Every word you say sharpens my surprise and my curiosity.”

“Yes, and every transaction you will have with the cipher will sharpen it more and more. I have been fifteen years in the Secret Service, but this business is to-day as much a puzzle as it ever was, for ‘No. 101’ has taught me a very important secret, one unknown even to the French King’s ministers, which, so jealously guarded as it is, may never be discovered in the King’s lifetime or at all. Can you really believe that Louis, while professing to act through his ministers, has stealthily built up a little secret service of his own whose work is to spy on those ministers, on his ambassadors, generals, and their agents, to receive privately instructions wholly different from what the King has officially sanctioned, and frequently directly to thwart, check, annul, and defeat by intrigue and diplomacy the official policy of their sovereign?”