"It's hard to say," admitted Tom. "They may be trying to get something belonging to me, or they may imagine they can pick up some valuable secrets. Or they may--" He stopped suddenly, and then exclaimed:
"Come on, Ned! They're after one of the airships! That's it! My big biplane is all ready to start, and they can get it in motion inside of a few seconds. Oh, why didn't I hurry?" he added, bitterly.
But the hangar was still some distance away, and it would take two or three minutes of running to reach it.
Meanwhile, and at the instant Tom had his thought of the possible theft of his biggest aircraft, something happened.
The doors of the shed were suddenly thrown open, and the two boys could see the large airship being wheeled out. The hazy light of the moon behind the clouds shone on the expanse of white planes, and on the fish-tail rudder, one of Tom's latest ideas.
"Hey, there!" cried Tom, warningly.
"Leave that alone!" yelled Ned.
"Koku! Koku!" shouted Tom, shrilly. "Get after those fellows!"
"Me get!" boomed out the giant, in his deep voice.
He had been standing near the entrance to the hangar, probably waiting for developments, and watching for the arrival of Tom and Ned. The big form was seen to leap forward, and then several dark shadows swarmed from around the airship, and were seen to fling themselves upon the giant.