condly, my airship was taken and brought
back, with a button more than it had when it went away. Said
button exactly matched one off Mr. Boylan's coat."

"Thirdly, Mr. Damon was either taken away or went away, in an
airship--either in mine or someone else's. Fourthly, Mrs. Damon
has received telephonic communications from the man, or men, who
have her husband. Fifthly, Mr. Peters, either legally or
illegally, is responsible for the loss of Mr. Damon's fortune.
Now: there you are--for the things we do know."

"Now for the things we don't know. We don't know who has taken
Mr. Damon away, nor where he is, to begin with the most important."

"Hold on, Tom, I think you're wrong," broke in Ned.

"In what way?"

"About not knowing who is responsible for the taking away of Mr.
Damon. I think it's as plain as the nose on your face that Peters
is responsible."

"I can't see it that way," said Tom, quickly. "I will admit that
it looks as though Boylan had been in my airship, but as for
Peters taking Mr. Damon away--why, Peters is around town all the
while, and if he had a hand in the disappearance of Mr. Damon, do
you think he'd stay here, when he knows we are working on the
case? And would he send Boylan to see me if Boylan had been one of
those who had a hand in it? They wouldn't dare, especially as they
know I'm working on the case."

"Peters is a bad lot. I'll grant you, though, he was fair enough
to pay for my motor boat. I don't believe he had anything to do
with taking Mr. Damon away."

"Do you think he was the person who was talking to Mrs. Damon
about the papers?"

"No, Ned. I don't. I listened to that fellow's voice carefully. It
wasn't like Peters's. I'm going to put it in the phonograph, too,
and let you listen to it. Then see what you say."

Tom did this, a little later. The record of the voice, as it came
over the wire, was listened to from the wax cylinder, and Ned had
to admit that it was not much like that of the promoter.

"Well, what's next to be done?" asked the young banker.

"I'm going to set a trap," replied Tom, with a grin.

"Set a trap?"

"Yes, a sort of mouse-trap. I'm glad my photo telephone is now
perfected, Ned."

"What has that got to do with it?"

"That's going to be my trap, Ned. Here is my game. You know this
fellow--this strange unknown--is going to call up Mrs. Damon
to-morrow. Well, I'll be ready for him. I'm going to put in the booth
where he will telephone from, one of