"Wonder what's up?" queried the latter. "I can't imagine," said Dave. "They tell you to cancel your dates," went on Hiram, looking very much worried. "Yes, that's what bothers me," replied Dave. "And to come on to the factory at once." "Perhaps they want to pay me off and let me go," suggested Dave, pretending to smile. "Don't take any trouble on your mind on that score," cried Hiram. "They'd search a long time before they'd find a better demonstrator than you are." "Thank you Hiram," said Dave. "The telegram is plain." "Yes, cancel all dates." "That's easy, I have nothing on the programme for the rest of the week." "There's the aero-hydroplane stunt." "But the machine hasn't arrived." "That's so." "Let's go down and see Grimshaw. I want to talk to him about this," said Dave. They found the airman at the Aegis hangar. Dave read him the telegram. Grimshaw looked bothered. "Too bad, when things are going so finely for you," he remarked. "I wish Mr. King was here," said Dave, "but he probably won't be until tomorrow." "Hardly, I should judge, from what he said," replied Grimshaw. "I had better start right off for the Interstate plant." "Yes. I would do that if I were you," advised Grimshaw. "I wish you would see the managers and explain about this," continued Dave. "Suppose the Drifter comes Dave?" asked Hiram. The Drifter was the name of the new model aero-hydroplane concerning which Dave had received a letter from the Interstate people that day, but written the day previous. "I'll see that it is handled all right," promised Grimshaw. "Tell Mr. King I will wire him just as soon as I learn what's up," said Dave. "You'll look after the Racer and the hydroplane, won't you, Hiram?" "Surely I will," pledged Hiram. Dave returned to his own quarters and packed a small hand bag. Hiram went to the railroad depot with him. They had to wait two hours for a south-bound train. The factory of the Interstate Aero Company was located at a city in Ohio. It was over three hundred miles from Columbus. The train Dave was on arrived at a junction about daylight the next morning. There he had to wait for a train on another road. He had slept a few hours and got his breakfast at the depot restaurant. According to schedule he would reach the Interstate plant about ten O'clock in the morning. Dave had been looking out of the car window enjoying the scenery and thinking over affairs in general, when he chanced to direct his gaze at a newspaper the man in the forward seat was reading. A glaring head line had caught his eye: "A Burglar In The Clouds." Anything suggestive of the air was of interest to the young aviator. He wondered what the item might refer to. Dave leaned over to try to scan the body matter of the article, when the locomotive whistled and the train slowed up for a station. The man in front of him shoved the newspaper into his pocket to leave the train. Then the incident drifted from the youth's mind.