Hiram and Elmer explored every nook and corner of the place where there was the least opportunity for a stowaway to hide. Their search was without results.
“It’s certainly something of a mystery,” decided the young aviator. “Those cracked windows, too. Why,” he added, examining them closely, “it looks as though some one had deliberately hammered on them until they gave way, as you see.”
There was another sensation the next evening. The cook came rushing into the cabin. Mr. King happened to be on hand.
“I’m getting superstitious and scared,” declared the cook.
“What’s up now?” interrogated the airman.
“Enough for anybody’s nerves,” reported the man. “Sounds, scrapings, sort of low groans. I’m beginning to believe the airship is haunted.”
“Nonsense!” said Mr. King. “When did you hear these strange noises you describe?”
“Just now. See here, some of you come with me and see if you can figure this thing out.”
The boys were ready enough for the investigation. The cook led them to the galley, and they sat down as he put out all the lights.
“Now keep perfectly quiet and listen patiently,” directed the young aviator.