Then how can I locate them?"

"You can trail my brother. Shadow the men also whom you will meet at our
home."

"I am to go to your house?"

"Yes."

"When?"

"Any time you may elect."

"And then?"

"I will conceal you. You can see the men who come to talk with my
brother. You can overhear all that passes. You can identify them and
shadow them. I think they go from our house to the secret workshop."

"I will arrange with you to go to your home."

"When?"

"At some future time."

"Very soon?"

"Yes."

"Within forty-eight hours?"

"Yes."

"And I have your promise that under no circumstances is my brother to be
arrested?"

"We may arrest him and let him turn state's evidence."

"No, no, never. I am only anxious to save him from disgrace. I am
revealing this to you in order to save him from disgrace. Yes, it is for
this purpose I am betraying his confederates."

"Can you meet me to-night?"

"I can."

"I must have time to think this matter over."

"We must act quickly."

"Yes."

"It would be better were you to make arrangements to go to my house by
to-morrow night at the latest."

"Yes, I will."

"Where shall I meet you to-night?"

"Here. We have dined together; we will sup together."

"We will meet near here?"

"Yes."

A corner was named and a little later the woman, who did not give her
name, and our hero separated. Later Oscar called upon Miss Lamb. He
learned from her that she had met a lady at the typewriting school where
Miss Lamb was a substitute teacher, and Miss Lamb had really referred
the lady to our hero upon gaining her confidence, and having learned
that she had need of a detective in a very delicate affair, the nature
of which had not been revealed to Miss Lamb.

When the detective parted from Miss Lamb he was more and more convinced
that the beautiful sister of the criminal was honest, and really
intended to put him on a "lay" that would indeed advance him to the top
rung of the profession.

An hour later Oscar met Cad, who wore a very serious look upon her face,
and she waited for a little time, when with a glitter in her eyes she
demanded:

"Who was that creature you dined with to-day?"

Oscar laughed in a merry way. He read the thoughts that were chasing
through Cad's mind, or, rather, he _imagined_ he did so.

"Did you see her, Cad?"

"Yes."

"Did you mark her beautiful, innocent face?"

"Her innocent face?" repeated Cad in a sneering tone.

"Yes, in