He was wearing a plastic eyeshield and carrying a blowtorch. âSorry about that,â he apologized. âIâm working on a wire coil with this torch. The coilâs too soft for the flame, and thatâs the reason for the noise and sparks.â
âThatâs okay,â Smoky said. âDonât worry about it.â
As the man walked off again, Chet crawled out from under the workbench and got to his feet. He looked embarrassed. âGuess I overreacted,â he said sheepishly.
Frank soothed his feelings. âItâs better than taking chances. Well, weâve seen the lab. Letâs report to Professor Young and find out about our assignment.â
The Bayport youths left Smoky Rinaldo tinkering with the heat shields on the atomic reactor. They rejoined the professor, who shuffled some papers, placed them on the desk, and leaned back in his swivel chair.
âHow do you like the Aerospace Lab?â he inquired genially.
âWe like it fine, Professor,â Frank declared, âexcept for one thing.â
âWhatâs that?â
âWe were being followed.â Frank told him about the man who seemed to be shadowing them through the lab.
Young frowned. âIâve never seen anyone who matches that description, but Iâll try to find out who he is. The lab is strictly off limits to unauthorized personnel.â
He ordered through the intercom an immediate search of the premises. Then he turned back to his visitors. âNow,â he said, âlet me tell you about the mystery.â
The boys leaned forward in their chairs, eager to hear every word.
âIt concerns Dr. Adrian Jenson,â Young went on. âYou may have heard of him.â
âThe rocket scientist,â Joe said. âHeâs been working on space probes ever since the astronauts landed on the moon.â
âAnd he won a prize for his math on trajectories,â Frank added. âThe path of reentry from outer space into the earthâs atmosphere.â
Young smiled. âYou know your rocketry,â he complimented them. âWell, Dr. Jenson and I have been working on a revolutionary new engine powered by nuclear energy. We call it the Firebird, and itâs due for a test flight in a couple of weeks. Dr. Jenson flew to Australia three days ago to follow the flight of the Firebird at the Woomera Monitoring Station.â
âAustralia?â Chet spoke up. âWhy there?â
âWhen a rocket is fired into orbit from our Space Flight Center, its path over the Southern Hemisphere is followed at tracking stations south of the equator. Woomera is one of the best of these installations. We are cooperating closely with the Australian government in monitoring our missiles, and our people go there frequently.â
âBut why the mystery?â Joe asked.
âDr. Jenson never got to Woomera. He hasnât been heard of since he left Princeton!â
Frank let out a low whistle. âDid he actually get on the plane?â
âYes. We checked with the airlines. He arrived in Sydney and picked up his luggage. There the trail ends. We also searched his desk for clues, but found nothing.â
âAnd youâve notified the Australian police?â Joe asked.
âWe did that immediately and theyâve been working on it ever since. However, both we and NASA wanted a top-flight investigator assigned to the case at this endâespecially since there were indications that the plotters had been after him in this country. Our projectâs top-secret, so the investigation has had to be kept under wraps, and your father seems the ideal man to handle it. But so far we have no real clue to Dr. Jensonâs whereabouts.â
âMaybe enemy agents kidnapped him!â Chet exploded. âMaybe theyâre brainwashing him!â
âThatâs possible,â Young admitted. âThe Firebird Rocket is classified. Dr. Jenson and I are the