"It was," answered the detective over the wire. "The telephone is
right next door to one. It's an automatic pay station and no one
seems to have noticed who the man was who telephoned. I couldn't
get a single clue. I'm sorry."
"Never mind," said Tom, as cheerfully as he could. "I think I'm on
the right track now. I'm going to lay a trap for this fellow."
CHAPTER XX
SETTING THE TRAP
Troublesome problems seemed to be multiplying for Tom Swift. He
admitted as much himself after the failure to capture the man who
had telephoned to Mrs. Damon. He had hoped that his plan of
sending detectives to the location of the telephones would
succeed. Since it had not the youth must try other means.
"Now, Ned," he said to his chum, when they were on their way from
Mrs. Damon's, it being impossible to do anything further there.
"Now, Ned, we've got to think this thing out together."
"I'm willing, Tom. I'll do what I can."
"I know you will. Now the thing to do is to go at this thing
systematically. Otherwise we'll be working around in a circle, and
won't get anywhere. In the first place, let's set down what we do
know. Then we'll put down what we don't know, and go after that."
"Put down what you don't know?" exclaimed Ned. "How are you going
to put down a thing when you don't know it?"
"I mean we can put a question mark after it, so to speak.
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