stuff.â
Young became solemn. âThatâs the whole point of the investigation youâre undertaking.â
They arrived at a room where a youth was working at a modified atomic reactor. Young introduced him as Smoky Rinaldo, a senior at Princeton University.
âSmoky can show you around from here on,â the professor said. âWhen youâve seen enough of the lab, meet me back at my office and weâll discuss your assignment.â
He walked off and Smoky informed the visitors that he was doing research for a term paper.
âIâm into rockets, myself,â Chet spoke up. âFact is, Iâve got my own missile.â
Frank chuckled. âYou almost didnât. It flew straightâstraight to earth.â
âWhat are you talking about?â Smoky asked.
âOh, nothing,â Chet said hastily. âWhy donât you show us the rest of the lab? I canât wait to see it.â
The young people wandered through the last row of rooms, which were assigned to scientists experimenting with the shape of nose cones and tail fins for partly developed rockets.
Suddenly a movement caught Frankâs attention. Looking out of the corner of his eye, he noticed a man behind them. He was tall and lanky and wore a black beard and tinted glasses.
Frank paused before a blow-up of a Saturn rocket. Joe and Chet joined him. The man stopped at a workbench and furtively glanced at them.
âI think weâve got a shadow,â the older Hardy informed Joe and Chet in an undertone.
Joe traced the curved line of a nose cone with his finger, pretending to be interested in it. âAre you sure?â he asked.
âNo. It could be a coincidence. Letâs go on and keep an eye on him.â
Joe turned as they walked farther, catching a glimpse of the man. âBeard with glasses?â he asked.
âRight.â
Smoky was slightly ahead of the group, explaining the interesting features of the lab. When they left the last room and walked back to where they had started, Chet asked, âWhoâs that guy with the beard over there?â
Smoky turned around to look. âIâve no idea. Matter of fact, Iâve never seen him before.â
The man obviously realized that the boys had noticed him, and instead of following them farther, he entered a door with the sign OFFICIAL PERSONNEL ONLY.
âHe must be on the staff here,â Smoky went on. âWould you like to see the reactor Iâm working on? The interior is hot enough to handle uranium.â
They walked over to the instrument. âWe canât see the interior,â Joe pointed out.
âThatâs because itâs running,â Smoky said. âJust follow me, and youâll find out whatâs in there.â He led the way to a diagram on the wall representing a slice through the reactor from top to bottom.
âThis is how the machine is put together,â the student explained. âThe core in the center marked A is where the uranium goes. The letter B stands for the pressure vessel, and C is the casing. These tubes extending from the core to the top are the fuelââ
A loud sputtering noise broke out. Red sparks fiashed through the air around them. Chet turned pale and shouted, âThe reactorâs going to explode!â
CHAPTER IV
A Strange Disappearance
CHET dived to the floor, crawled under a workbench, turned around on his hands and knees, and stared at the other three. Frank, Joe, and Smoky remained standing.
âYou guys want to get blown up?â Chet quavered.
âFalse alarm, Chet,â Smoky said.
âHow do you know?â Chet demanded.
âBecause that wasnât the atomic reactor,â Smoky explained. âIt has a failsafe protection. If anything goes wrong, the motor shuts off automatically. And besides, this is a modified reactor. It doesnât have enough power for an atomic explosion.â
A man in overalls came over.