"They couldn't—as long as they remained in possession," Tom said. "But that's the trouble. I'm afraid they haven't. What has probably happened is that under the direction of this man, who brought the forged note from me, Koku and the others took the tank where he directed them, thinking to meet me. Then, reaching the place where the rest of the plotters were concealed, they overpowered Koku and the others and took possession of the machine."
"They'd have trouble with Koku," suggested Ned.
"Yes, but even a giant can't fight too big a crowd, especially if he is taken by surprise, and that's probably what happened," remarked Tom. "Now the question is where is the tank, and how can we get her back? Every minute counts. If those German spies and their helpers remain in possession long, they'll find out enough of my secrets to enable them to duplicate the machine, and especially some of the most exclusive features. We've got to get after 'em!"
"They imitated your writing pretty well, Tom," Observed Ned, as he looked at the forged note.
"Yes; that's why they took all my papers away from me—to get specimens of my handwriting. I half suspected that, but I didn't quite figure out what their game was. Well, we know the worst now, and that's better than working in the dark. Now I'm going to have a bath and get into some decent clothes, and we'll see what we can do."
"Count on me, Tom!" exclaimed Ned. "I'll go the limit with you!"
"I knew you would, old man!"
"And me, too!" cried Mr. Damon. "Bless my open fireplace, but I'll send word to my wife that I'm not coming home to-night, and we can start the first thing in the morning, Tom."
"Yes; there isn't much use in going now, as it will soon be dark."
"How are you going to trace the tank, Tom?" asked Ned, when his chum had bathed and gotten into fresh clothes.