“When did you arrive?”

“Half an hour ago.”

“Alone?”

“As you see,” said Nick evasively.

Chief Welden swung round in his swivel chair, so as to directly face the noted detective. There had been other times when the keen and clever men under his direction had been baffled by perplexing problems, resulting in an appeal to the famous New York detective; but judging from Welden’s expression at that moment, none could have been more important than that which had occasioned this summons of Nick Carter to Washington, an appeal direct from the president himself.

“I will tell you as briefly as possible what has occurred, Nick, and why it has been thought wise to employ you,” said Welden.

“Do so,” bowed the detective.

“To begin with, Carter, we have in the war department a young man named Harold Garland. He is about thirty, remarkably gifted along certain lines, and strictly reliable. Understand that at the outset; his integrity is above suspicion. I am absolutely sure of that.”

“Very good,” said Nick. “What about him?”

“He is a graduate from West Point, and is in the employ of the government as an expert engineer, in which capacity he is, as I have said, remarkably gifted. He unquestionably is without a peer in this country in his special line. He has an office in the war department, and I will presently send for him.”