“Secret business, or——”

“Well, in a way,” said Nick, when the other paused with an inquiring squint. “It relates to the theft of some important documents.”

“I see,” Captain Dillon nodded, with steadfast scrutiny. “Diplomatic correspondence, perhaps, or——”

“No, not exactly,” smiled Nick. “They are, in fact, of a very different character. I am not at liberty to inform you precisely, however, as you may infer.”

“Yes, certainly,” Dillon readily allowed. “But did you expect to find them here, or——”

“Well, no, not quite that,” Nick again replied agreeably, as if oblivious to the other’s insinuating manner. “That would be too much to have expected. I am inclined to distrust a certain person who now is at supper, here, however, and I’m keeping an eye on him.”

“Ah, I see.”

“But do not imagine, Captain Dillon, because I am seated so near your table, that he is in your party,” Nick added, in jesting fashion.

Captain Dillon laughed softly and shrugged his shoulders.

“I should hope not,” he replied, with a deprecatory gesture. “All of my party are above suspicion. You know Senator Barclay by sight, of course, and the dark-haired girl is his daughter. That tall, fine-looking chap is Captain Garland, a government engineer in the war department. I really must rejoin them now. Here is my card. If you remain long in town and find it convenient, call and see me. I would be delighted.”