<h2 id="c2">CHAPTER II <br/><span class="small">GHOSTS, GUM—AND GEMS</span></h2>
<p>For a long minute Dick, Larry and Sandy
stood in a compact group, feeling rather stunned
by the sudden springing of the trap, as they
considered the closed hangar.</p>
<p>Larry, calm and cool in an emergency, was
first to recover.</p>
<p>“Even if Jeff did want to catch us and demand
ransom to let us go,” he remarked quietly,
“he wasn’t outside that rolling door—and I
don’t think he could pull it down anyhow.”</p>
<p>“No,” Dick agreed, seeing no fun in the situation
for once. “See! There is a motor connected
to a big drum up in the top of the hangar, and
the door is counterbalanced so that turning the
drum winds up the cable that pulls it up. I
suppose the motor reverses to run it down
and——”</p>
<p>“What was that?”</p>
<p>Sandy’s voice was tense and strained.</p>
<div class="pagenum" id="Page_14">14</div>
<p>They heard the strange, hollow sound again,
seeming to come from the metal wall, but impossible
to locate at once because of the echo.</p>
<p>Rap—tap—tap!</p>
<p>“Somebody’s knocking,” Dick gasped.</p>
<p>“Not somebody—something!” corrected
Sandy. “The same ‘something’ that worked
the door and shut it!”</p>
<p>“Gracious-to-gravy!” exclaimed Larry, “you
don’t believe in ghosts, do you, Sandy? Not
really!”</p>
<p>“No human hand touched the switch that ran
that door down!”</p>
<p>“I think it did!” challenged Larry. “We
thought we saw somebody at the back of the
hangar—that’s why we came in! I’m going to
see where he is, what he’s doing and why he’s
trying to fright—frighten us!”</p>
<p>He broke his sentence in the middle of a word
because the queer knocking repeated itself, but
with quick presence of mind he completed his
phrase to steady Sandy, whose face was growing
drawn with dismay.</p>
<p>Larry took a swift, sharp look around the
enclosure.</p>
<p>“There’s a big, closed can for waste and oily
rags,” he commented, “but anyone would suffocate
who hid in that!”</p>
<div class="pagenum" id="Page_15">15</div>
<p>“Well, there’s a clothes cupboard—in the back
corner,” Dick said. “Let’s look in that, you
and I. Sandy, you stay back and keep watch.”
Dick, quick to see Larry’s attitude toward
Sandy, wanted to have a dependable chum at
his side as he investigated while he hoped to
give Sandy more confidence by leaving him in
the lighted part of the building, under the
smudged, dusty skylight.</p>
<p>“Come on!” agreed Larry.</p>
<p>With Dick he walked boldly enough to the
built-in wooden cupboard, protected from dust
by a heavy burlap hanging.</p>
<p>Throwing the curtain aside sharply, both
youths peered in.</p>
<p>“Nothing but old overalls and some tools on
the floor,” Dick commented.</p>
<p>“It’s peculiar,” Larry said doubtfully. “Nobody
here—but—” a new idea struck him.
Quietly he gestured toward the amphibian, old,
uncared for, looking almost ready to fall apart,
its doped wings stained with mould, its pontoons
looking as if the fabric was rotting on them.</p>
<p>Dick, instantly catching Larry’s notion, went
to the forward seat, while Larry took the second
compartment behind the big fuel tank.</p>
<p>“Nobody here,” he reported, and investigated,
by climbing in the vacant part of the fuselage
toward the tail.</p>
<div class="pagenum" id="Page_16">16</div>
<p>“This place is empty, too,” Dick agreed.
“Where could?——”</p>
<p>“Oh!”—Sandy almost screamed the word as
the dull, hollow knocks came again.</p>
<p>Larry leaped from the wing-step, sent his
sharp gaze rapidly around the enclosure and,
of a sudden, gripped Dick’s arm so tightly that
the plump youth winced and grew chilly with
apprehension.</p>
<p>At once he saw Larry’s amazed, relieved expression
and followed the older comrade’s eyes.</p>
<p>With an instant return of his old amused self
he threw back his head and let out a deep howl
of delight.</p>
<p>“Oh—ho-ho-ho-ha-ha! Oh, my!—ho-ho——”</p>
<p>“What’s the matter with you?” demanded
Sandy. “Have you gone silly?”</p>
<p>“Oh—ho-ho! Suspicious Sandy!—ho-ho!”</p>
<p>Larry explained.</p>
<p>“You got us all worked up and worried,” he
told Sandy, “with your suspicions. And all the
time——”</p>
<p>“Ho-ho-ha-ha! All the t-time, we were like
mice racing around a treadmill.” Dick had to
speak between chuckles. “All the time we ran
around in circles so fast we didn’t see the end
of the cage. Sus—suspicious Sandy! Thinking
we would be trapped and held for ransom!
Ho, golly-me! Look around you, Sandy!”</p>
<div class="pagenum" id="Page_17">17</div>
<p>Sandy looked.</p>
<p>His face slowly changed, gradually became
red.</p>
<p>“Oh!” His voice was sheepish. “You mean
the switch for the motor over by that small
metal door they use when they don’t want to
run up the big one?”</p>
<p>“That runs the motor,” Larry agreed. “The
cable must have slipped on the drum and let
the door go down——”</p>
<p>“But,” Sandy clung obstinately to his theories,
“why did Jeff pick this haunted place and cut
the ignition—and why was the door up in the
first place?”</p>
<p>“What do we—ho-ho—care?” Dick chuckled.
“Another thing—even if the electric current is
off and the motor doesn’t work—look at that
small, hinged door—do you see that the knob
of the spring lock—is on—our—side!” He broke
out in a fresh cackle of laughter.</p>
<p>“But—those raps——”</p>
<p>For reply Larry strode over to the metal door
set in the wall for use when anyone chose to
enter or leave the hangar.</p>
<p>Throwing it open, he faced Jeff.</p>
<div class="pagenum" id="Page_18">18</div>
<p>“Took you long enough to answer!” grumbled
Jeff. “What made you fool with that door and
shut yourselves in?”</p>
<p>“What made you cut the ignition!” snapped
Sandy, working on the idea he had read in so
many detective stories that a surprise attack
often caused a person to be so startled as to
reveal facts.</p>
<p>Larry and Dick turned their eyes to Jeff.</p>
<p>The older pilot, staring at his accuser for an
instant, as though hesitating about some sharp
response, suddenly began to chuckle.</p>
<p>“That-there is one on me!” he admitted.
“You must have mighty quick eyes.”</p>
<p>“I don’t miss much!” Sandy said meaningly.</p>
<p>“None of us do!” Dick caught the spirit of
Sandy’s accusing manner. “I know you’ve been
here before, too. There are lots of chunks of old
chewing gum stuck around in that front compartment
of the amphibian—and someone has
been working on it, too. I saw the signs.”</p>
<p>“Chewing gum?” Jeff was startled. Swiftly
he strode across the dimly sunlit floor, got onto
the forward step, peered into the cockpit.</p>
<p>“That-there certainly is queer,” he commented.
“You’re right. Gum is stuck every
place, wads of it.”</p>
<div class="pagenum" id="Page_19">19</div>
<p>“And you chew gum!” snapped Sandy, unwilling
to be left out of the suddenly developing
“third degree” he had begun. Jeff made a
further inspection, touched a bit of the dried
gum curiously, stepped down and stood with a
thoughtful face for a moment.</p>
<p>Presently he walked to an old soap box holding
metal odds and ends, washers, bolts and so
on. This he up-ended. He sat down, his lean
jaws working as he chewed his own gum slowly.
Around him, like three detectives watching the
effect of a surprise accusation, stood the chums.</p>
<p>Presently Jeff looked up at them.</p>
<p>“Looks bad, this-here, don’t it?” He grinned.</p>
<p>Dick, Larry and Sandy were silent.</p>
<p>“I guess I better explain,” Jeff decided. “I
didn’t think you was so suspicious and quick or
I’d of done different.”</p>
<p>“You can’t trap us!” challenged Sandy.</p>
<p>“Trap you?——”</p>
<p>“Well, didn’t you make friends with us and
let us work on your crate and help get passengers
that you never took up? Didn’t you say
you’d give us a joy-ride, then come straight
here, cut out your ignition and make believe you
had a dead stick, land and then try to get us into
this haunted hangar?” Sandy ran out of breath
and stopped.</p>
<p>“I do think you ought to explain!” Larry said
quietly.</p>
<div class="pagenum" id="Page_20">20</div>
<p>“Yes, I did all that—and I guess I will explain.
I meant to, anyhow—or I wouldn’t have
brought you here.”</p>
<p>They waited, neither convinced nor satisfied.</p>
<p>Fixing accusing eyes on Sandy, Jeff spoke:</p>
<p>“I never dreamed you’d be suspicious of me!
I made friends with you all and tried you out
to be sure you were dependable and honest and
all that—and I did bring you to this place because
it is so far from telephones and railroads.
But I didn’t think you’d get the wrong idea. I
only wanted you in a place it would take time to
get away from if you refused to help me.”</p>
<p>“Help you—help you with what?”</p>
<p>Speaking seriously, Jeff replied to Larry’s
challenge.</p>
<p>“Help me save the most valuable set of emeralds
in the world from being—destroyed!”</p>
<div class="pagenum" id="Page_21">21</div>
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