turns guarding the Hardy home while Frank and Joe were out of town.
At the airport Jack greeted them with some disturbing news. âTwo toughs have been asking questions about you. I didnât know who they were so I kept my mouth shut and they went away no wiser than when they came.â
âWhatâd they look like?â Frank asked.
Jack described the pair.
âSnap Brim and Beret,â Joe commented.
âWhatâs that?â Jack asked.
âThatâs the headgear they were wearing when we first met them,â Joe explained. âYou see, weâre real close to those two. In fact, too close for comfort.â
âNew case?â Jack inquired.
âRight,â Frank replied. âCould their angle this morning have been to arrange an accident for our plane?â
âThey might have had that in mind, but I didnât let them anywhere near it. Every working part is in order. Well, Iâd better turn the engine over a few times. Warm her up for take-off. Wonât take more than a few minutes.â
âOkay,â Frank said. âIâm rather thirsty, so Iâll grab a quick cup of tea in the cafeteria meanwhile.â
âIâll come with you,â Joe said. âWeâll meet you at the plane, Jack!â
As they were sipping their steaming tea, a voice echoed over the loudspeaker. âCalling Frank and Joe Hardy! Calling Frank and Joe Hardy!â
They looked at each other in surprise. âWhat do you make of that?â Joe asked.
Frank shrugged. âLetâs go find out!â
They hastened to the desk and were informed that Mr. Marks wanted them to meet him at one of the airport repair shops. The clerk gave them directions.
âSo Dad finally surfaced and right here!â Frank said. âWonder why he picked this place.â
âI was there with Jack Wayne once,â Joe replied. âHe told me that itâs hardly ever used in the morning. At this time it should be vacant.â
âThis could mean two things. Either this is on the level and Dad doesnât want to be seen, or itâs a neat little trap set up by our two buddies.â
âLetâs proceed with caution,â Joe advised as they approached the shop. No one was in sight. Frank slowly opened the door. There were power tools in one corner; drills, auger bits, and screwdrivers along the wall.
âMr. Marks?â Frank called out.
âSh! Over here, Frank!â came a whispered reply.
The boys walked inside. Parts of a dismantled engine lay on a broad workbench. Crates stood piled up behind it. There were no workmen in sight.
Suddenly Frank and Joe had visions of roman candles going off, followed by an explosion of blinding light. Then they blacked out!
CHAPTER V
The Missing Missile
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A VOICE that seemed to come from far off said, âFrank, Joe, wake up!â
Groggily Joe opened his eyes. The repair shop came into focus. So did Jack Wayne, who was squatting on his heels and shaking him by the shoulder.
âBoy, whoever clouted you on the head really did a good job!â the pilot said as the boys came to. âYou both were unconscious when I found you!â
âYou can say that again,â Frank groaned. âThe place seemed empty when we came in. Somebody whispered âOver here,â and it sounded just like Dad. Then, pow! The building caved in on us.â
Joe rubbed the back of his head gingerly, wincing when he touched the bump caused by the blow. He rose unsteadily to his feet, bracing himself with one hand on the doorknob. âI didnât see anyone, either. Iâd swear we were mowed down by a runaway jetliner! Whoever sapped us must have been hiding behind the door.â
âAnd he, or they, laid you two out like a couple of iced mackerel,â Jack observed.
âWe walked right into that trap,â Frank said ruefully. âShould have known better. I bet Snap Brim and