"Hello!" challenged old Grimshaw, appearing at the open doorway of
the hangar. "What you up to, Dashaway?"

Dave flushed guiltily. He was dreadfully embarrassed to be "caught
in the act" as it were, by his great friend, the old airman.

"Why--you see, Mr. Grimshaw--" stammered Dave.

"Yes, of course I see," retorted the old man firmly. "You're going
to start out a night like this."

"I've got to, Mr. Grimshaw," declared Dave desperately.

"Business, eh?"

"Of the most important kind."

"What is it?"

It was in order for Dave to explain details, and did so briefly.

"H'm," commented Grimshaw, when his pupil concluded his explanation.
"And so you thought you'd steal away without letting me know it?"

"Oh, now, Mr. Grimshaw!" Dave hastened to say-- "that was not the
spirit of the thing at all."

"Go ahead, Dashaway."