What sort of a sound was it?"
"Why, a whirring, throbbing noise, like--like--"
She paused for a comparison.
"Like an airship?" asked Tom, with a good deal of eagerness.
"That was it!" cried Mrs. Damon. "I was trying to think where I
had heard the sound before. It was just like the noise your
airship makes, Tom!"
"That settles it!" exclaimed the young inventor.
"Settles what?" asked Ned.
"The manner of Mr. Damon's disappearance. He was taken away--or
went away--in my airship--the airship that was stolen from my shed
last night!"
Mrs. Damon stared at Tom in amazement.
"Why--why--how could that be?" she asked.
Quickly Tom told of what had happened at his place.
"I begin to see through it," he said. "There is some plot here,
and we've got to get to the bottom of it. Mr. Damon either went
with these men in the airship willingly, or he was taken away by
force. I'm inclined to think he went of his own accord, or you
would have heard some outcry, Mrs. Damon."
"Well, perhaps so," she admitted. "But would he go away in that
manner without telling me?"
"He might," said Tom, willing to test his theory on all sides. "He
might not have wanted you to worry, for you know you dislike him
to go up an airships."
"Yes, I do. Oh, if I only thought he did go away of his own
accord, I could understand it. He went, if he did, to try and save
his fortune.
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