They learned later that the girl had taken frequent flights in the South, where her father had, for a time, entered into the business of giving aeroplane flights for money at county fairs and the like. His daughter had taken naturally to the sport, and was an accomplished air woman. She knew no fear, and her imperious, ambitious spirit made her a formidable rival even to the foreign flying women who competed at various international aviation meets.

While his daughter spun through the air, Eugene Mortlake sat in his little glass-enclosed office in one corner of the noisy aeroplane plant. Four finished machines were now ready, and he would have felt capable of facing any tests with them had it not been for his uneasy fear of the Prescott aeroplane. But he had evolved a scheme by which he thought he would succeed in putting Peggy and Roy out of the race altogether. It was in the making that afternoon in the little office.

Opposite to Mortlake sat two men whom we have seen before. But in the cheap, but neat suits they now wore, and with their faces clean-shaven of the growth of stubby beard that had formerly covered them, it would have been somewhat difficult to recognize the two ill-favored tramps who had been routed by Peggy in such a plucky manner. But, nevertheless, they were the men.

"You thoroughly understand your instructions now?" questioned Mortlake, as he concluded speaking.

The fellow who had been addressed by his companion as Joey, at the time they encountered Mortlake and Harding on the road to the Galloway farm, nodded.

"We understand, guv'ner," he rasped out in a hoarse voice; "Slim, here, and me don't take long ter catch on, eh, Slim?"

"No dubious manner of doubt about that," responded Slim. "An' although I'm a tramp now, guv'ner, I wasn't allers one. I've held my head as high as the rest of the good folks of the world. I can play the gentleman to perfection. Don't you worry."

This Slim—or to give him his correct name—Frederick Palmer, was, as he declared with such emphasis, a man who had indeed "seen better days," as the phrase is. Now that he was invested in fair-looking clothes, and was graced with a clean collar and a smooth-shaven face, he actually might have passed for a person in fairly well-to-do circumstances. For the part Mortlake wished him to play, he could not have picked out a better man. Utterly unscrupulous, and with the best of his life behind him, "Slim"—as the tramp fraternity knew him—was prepared to do anything that there was money in. His companion possessed no such saving graces of appearance. Short, coarse, and utterly lacking in every element of refinement, Joey Eccles was a typical hobo. But Mortlake's shrewd mind had seen where he could make use of him, too, in the diabolical plan he was concocting, and the details of which he had just finished confiding to his unsavory lieutenants.

"But say, guv'ner," struck in Joey Eccles, his little pig-like eyes agleam with cupidity, "we've got to have a bit more of the brass, you know—a little more money—eh?"

He ended in an insinuating whine, the cringing plea of the professional beggar.