for the next few days the chums were kept busy fitting the silent motor into one of Tom's several airships.
"Well, I think we can make a flight to-morrow," said the young inventor, about a week later. "I need some new bolts though, Ned. Let's take a walk into town and get them. Oh, by the way, have you seen anything more of Andy Foger?"
"No. and I don't want to. I suppose he's gone back home after his visit to Sam. Let's go down the street, where the Foger house is, and see if there's anything going on."
As the two lads passed the mansion, they saw a man, in the kind of suit usually worn by a carpenter, come out of the back door and stand looking across the garden. In his hand he held a saw.
"Still at the repairs, I guess," remarked Ned. "I wonder what--"
"Look there! Look! Quick!" suddenly interrupted Tom, and Ned, looking, saw someone standing behind the carpenter in the door. "If that isn't Andy Foger, I'll eat my hat!" cried Tom.
"It sure is," agreed Ned. "What in the world is he doing there?"
But his question was not answered, for, a moment later, Andy turned, and went inside, and the carpenter followed, closing the door behind them.
"That's queer," spoke Tom.
"Very," agreed Ned. "He didn't go back after all. I'd like to know what's going on in there."
"And there's someone else who would like to know, also, I think," said Tom in a low voice.
"Who?" asked Ned.
"That man hiding behind the big tree across the street. I'm sure he's watching the Foger house, and when Andy came to the door that time, I happened to look around and saw that man focus a pair of opera glasses on him and the carpenter."
"You don't mean it, Tom!" exclaimed Ned.
"I sure do. I believe that man is some sort of a spy or a detective."
"Do you think he's after Andy?"
"I don't know. Let's not get mixed up in the affair, anyhow. I don't want to be called in as a witness. I haven't the time to spare."
As if the man behind the tree was aware that he had attracted the attention of our friends, he quickly turned and walked away. Tom and Ned glanced up at the Foger house, but saw nothing, and proceeded on to the store.
"I'll wager anything that Andy has been getting in some sort of trouble in the town he moved to from here," went on Tom, "and he daren't go back. So he came here, and he's hiding in his father's old house. He could manage to live there for a while, with the carpenter bringing him in food. Say, did you notice who that man was, with the saw?"
"Yes, he's James Dillon, a carpenter who lives down on our street," replied Ned. "A nice man, too. The next time I see him, I'm going to ask him what Andy is doing in town, and what the repairs are that he's making on the house."
"Well, of course if Andy has been doing anything wrong, he wouldn't admit it," said Tom. "Though Mr. Dillon may tell you about the carpenter work. But I'm sure that man was a detective from the town where Andy moved to. You'll see."
"I don't think so," was Ned's opinion. "If Andy was hiding he wouldn't show himself as plainly as he did."
The two chums argued on this question, but could come to no decision. Then, having reached Tom's home with the bolts, they went hard at work on the airship.
"Well, now to see what happens!" exclaimed Tom the next day, when everything was ready for a trial flight. "I wish Mr. Damon was here. I sent him word, but I didn't hear from him."
"Oh, he may show up any minute," replied Ned, as he helped Tom and Koku wheel the newly-equipped airship out of the shed. "The first thing you'll hear will be him blessing something. Is this far enough out, Tom?"
"No, a little more, and then head her up into the wind. I say, Ned, if this is a success, and--"
Tom stopped suddenly and looked out into the road. Then, in a low voice, he said, to Ned:
"Don't move suddenly, or he'll suspect that we're onto his game, but turn around slowly, and look behind that big sycamore tree in front of our house Ned. Tell me what you see."
"There's a man hiding there, Tom," reported his chum, a little later, after a cautious observation.
"I thought so. What's he doing?"
"Why he--by Jove! Tom, he's looking at us through opera glasses, like that other--"
"It isn't ANOTHER, it's the same fellow!" whispered Tom. "It's the spy who was watching Andy! I'm going to see what's up," and he strode rapidly toward the street, at the curb of which was the tree that
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