“I see,” spoke Tom.  “Now will you give an account of yourself, or shall I hand you over to the police?” he asked sternly of the man.  “What were you sneaking up on us in that fashion for?”

“Well, I guess this isn’t your property!” blustered the man.  “I have as good a right here as you have, and you can’t have me arrested for that.”

“Perhaps not,” admitted Tom.  “You may have a right on this land, but if you are honest, and had no bad intentions, why were you sneaking up, trying to keep out of sight?  And why did you have a big knife?”

“That’s my business, young man.”

“All right, then I’ll make it my business, too,” went on the young inventor.  “Hold him, Koku, until I can find Mr. Damon, or Ned, and I’ll see what’s best to be done.  I wish Mr. Whitford was here.”

“Aren’t you going to let me go?” demanded the man.

“I certainly am not!” declared Tom firmly.  “I’m going to find out more about you.  I haven’t any objections to any one coming to look at my airship, out of curiosity, but when they come up like a snake in the grass and with a big knife, then I get suspicious, and I want to know more about them.”

“Well, you won’t know anything more about me!” snarled the fellow.  “And it will be the worse for you, if you don’t let me go.  You’d better!” he threatened.

“Don’t pay any attention to him, Koku,” said Tom.  “Maybe you’d better tie him up.  You’ll find some rope in the motor room.”

“Don’t you dare tie me up!” blustered the prisoner.

“Go ahead and tie him,” went on Tom.  “You’ll be free to guard the ship then.  I’ll go for Ned and Mr. Damon.”

“Tie who up?  What’s the matter?” asked a voice, and a moment later the government agent came along the woodland path on his horse.  “What’s up, Tom?  Have you captured a wild animal?”

“Not exactly a wild animal.  Mr. Whitford.  But a wild man.  I’m glad you came along.  Koku has a prisoner.”  And Tom proceeded to relate what had happened.

“Sneaking up on you with a knife; eh?  I guess he meant business all right, and bad business, too,” said Mr. Whitford.  “Let me get a look at him, Tom,” for Koku had taken his prisoner to the engine room, and there, amid a storm of protests and after a futile struggle on the part of the fellow, had tied him securely.

Tom and the custom officer went in to look at the man, just as Ned and Mr. Damon came back from their stroll in the woods.  It was rapidly getting dusk, and was almost time for the start of the usual flight, to see if any trace could be had of the smugglers.

“There he is,” said Tom, waving his hand toward the bound man who sat in a chair in one corner of the motor room.  The young inventor switched on the light, and a moment later Mr. Whitford exclaimed: 

“Great Scott!  It’s Ike Shafton!”

“Do you know him?” asked Tom eagerly.

“Know him?  I should say I did!  Why he’s the man who pretended to give one of my men information about smugglers that drew us off on the false scent.  He pretended to be for the government, and, all the while, he was in with the smugglers!  Know him?  I should say I did!”