"That's right," he said at last. "I'm going to pay him back." He rose to his feet. "Come, I shall go with you," and they all passed out into the night.
CHAPTER XIX.
INTO SERBIA.
Two days later and we find our friends once more in the air and sailing swiftly toward the rising sun.
"Seems to me we should be along about there some place," declared Hal, taking his eyes from the distance ahead for a brief moment.
"Unless you have not gauged your course accurately," replied Chester.
"I'm sure I have made no mistake," said Hal.
"Then we should be about there."
"About where, that's what I want to know," put in Anthony Stubbs, from his place in the rear of the large army plane, the same in which the four friends had made their escape from the Austrians not so many days before. "Where are we headed for, anyway?"
"That will be a little surprise for you, Mr. Stubbs," Chester returned.