other words, I had you under observation from the day I received your
letter to this very moment."

"You learned much concerning me?" asked Harren quietly.

"_Ex_actly, my dear sir."

"But," continued Harren with a touch of malice, "you didn't learn that
my leave is up to-morrow, did you?"

"Yes, I learned that, too."

"Then why did you give me an appointment for the day after to-morrow?"
demanded the young man bluntly.

The Tracer looked him squarely in the eye. "Your leave is to be
extended," he said.

"What?"

"_Ex_actly. It has been extended one week."

"How do you know that?"

"You applied for extension, did you not?"

"Yes," said Harren, turning red, "but I don't see how you knew that I--"

"By cable?"