"That's what I want--not that I think you haven't done all you
could," interposed the agent.

"Well, if I can figure out some way, by which I think I can come
anywhere near catching these smugglers, I'll undertake the work!"
exclaimed Tom. "I'll do it as a duty to Uncle Sam, and I don't want
any reward except my expenses. It's going to cost considerable, but--"

"Don't mind the expense!" interrupted Mr. Whitford. "Uncle Sam will
stand that. Why, the government is losing thousands of dollars every
week. It's a big leak, and must be stopped, and you're the one to
stop it, Tom."

"Well, I'll try. I'll see you in a couple of days, and let you know
if I have formed any plan. Now come on, Ned. I'm tired and want to
get to bed."

"So do I," added the agent. "I'll call on you day after to-morrow,
Tom, and I expect you to get right on the job," he added with a
laugh.

"Have you any idea what you are going to do, Tom?" asked his chum,
as they turned toward their houses.

"Not exactly. If I go I'll use my noiseless airship. That will come
in handy. But this night business rather stumps me. I don't quite
see my way to get around that. Of course I could use an ordinary
searchlight, but that doesn't give a bright enough beam, or carry
far enough. It's going to be quite a problem and I've got to think
it over."