“It seems to be your pleasure to speak in enigmas, colonel,” said the detective.

“In enigmas? How so, sir?” was the reply.

“You speak of certain important papers which are of untold value, and announce that one-half of those papers have disappeared; as if the papers were a melon, or an apple that one might cut into two parts—dividing them equally. Be good enough to explain what you mean.”

“Ah; I made the announcement just as it came to me; but I did not intend to puzzle you, Mr. Carter.”

“Well?”

“Perhaps it will be the pleasure of the ambassador, when you talk with him, to explain to you exactly what those papers are; but I have not permission to do so. In fact I am not entirely informed upon the subject myself. I know only so much about them as it was necessary for me to know, to carry out my part of the work.”

“I understand.”

“Let me endeavor to explain in this way: His majesty, the czar, is interested in accomplishing a certain purpose that is well defined in his own mind, and in the minds of his counselors, which relates to another government—not the United States. You understand that, Mr. Carter?”

“I think so.”

“I was instructed to assure you that you would not be asked to do anything that you could not conscientiously perform as a loyal citizen of the United States.”