She has a party
who will represent her brother, and by degrees and methods of her own,
aided by her confederates, they will run down our side of it, and then
at the last moment every one of us will be separately lured and done up.
And they will make their plans so there will be no help for us, or
rather there would be no help for us did they catch us unawares. But
that they will never do; we will catch them in their own netting."

"Oh, Cad, how much I owe to you! and now what shall I do?"

"Meet her, and I will wager that there will be some of her gang hovering
around. We can play a very ingenious trick and open up their scheme."

"How will you do it?"

"I can make up for you."

"You can do it perfectly."

"To-night I will go to meet this siren."

"No, no, I will meet her."

"Yes, you shall meet her, but listen: I will go to meet her; you will be
on _my_ track. You will see who will follow me, believing that they are
following you. We can arrange where, at a given point, I will disappear
and you will reappear, and then when you go to meet this siren you will
know just exactly how the ground lays. You will have the whole business
down on them."

"Cad, this is a great scheme."

"It is, if we play it out right. This girl will be working you for an
innocent; you can afford to give her a great deal of information, and--"
The girl stopped short.

"Go on," said Oscar, "what will you be doing?"

"Why, man, between us, matching them at their own game, we will get the
identities of every member of the gang. We will learn where their shops
and where their plates are."

"How will we do it?"

"We will know just whom to shadow for each separate bit of information."

"By ginger! you are right."

"Now that you are up to this siren's movements I can trust you, Oscar."

"I might have gotten on to her plans. I was not about to surrender on
demand, but it is better as it is. Time is saved, and to-night we will
work our scheme. You shall be Oscar; I will be Cad, and at the proper
moment we will resume and let the game go on."

"That is my idea."

That night at the proper hour an individual who looked very much like
Oscar might have been seen hovering in the vicinity of the restaurant
where the interview between the detective and the siren was to take
place.

Our readers can grasp what was going on. Oscar, gotten up as a female,
was on the "shadow," and very speedily all that Cad Metti had told him
was confirmed. H