“Something might,” conceded Tim, “and then what would you do a couple of thousand feet up in the air and traveling at 100 miles an hour? No, Ralph, not to-night.”

The roar of the mail coming in from the west halted their conversation and Tim turned to direct the work of the mechanics while Ralph, realizing his helplessness, watched the final preparations.

Just as the mail trundled to a stop the lights on the field blinked out. There were shouts and calls for flashlights and a minute or two later the mechanics started their work of servicing the plane. In ten minutes it was ready to continue its eastward flight.

The pilot, slouched in his cockpit, waved for the mechanics to pull the blocks and gave his ship full throttle. Down the field he sped, then leaped into the air. His riding lights were disappearing in the east when the field beacons flashed on again.

Speeding into the night at one hundred miles an hour, Tim looked back and chuckled. In place of the regular mail plane, his own trim, fast little craft was rocketing eastward with dummy sacks of mail. It had been carefully camouflaged to look like the regular plane and when the lights went out, the larger ship had been pushed into a hangar and Tim’s wheeled out in its place.

In less than another hour Tim would know just how good his theory and plans had been. He was willing to stake his life on them. The night air was exhilarating. Tim didn’t want to die; in fact, he had no intention of doing so. As he raced through the scudding clouds, he carefully checked his plans. Ahead of him two long black machine guns peered over the edge of the cockpit.

For nearly an hour the racy little ship flew through the half clear night. When Tim sighted the curving light line that was the Cedar River, he eased the throttle. His greatest assignment was just ahead—if the air raiders were waiting!

Tim cut his speed to that of the regular mail plane. His riding lights glowed brightly. The young flyer tensed; eager for the test.

Whrrrrrrr! A roaring black plane flashed from the clouds above, it powerful motor spitting flame. Tim’s heart leaped. His mind was racing madly.

The black plane bore down on him. Tim ducked, and the vulture of the skies stormed past. Tim’s own plane held its course. He had escaped from the invisible death. Instead of falling, a wisp of humanity in a lifeless plane, he was hard on the tail of the bandits’ plane.