"That's all nonsense. You can't arrest any man. You're but a boy yet."
"Yes, that's so. But I got one of 'em to-day. I could call that cop over here now and get another but I am not ready for you yet."
"What do you mean?' the man asked, turning pale with a frightened look in his eyes.
"I mean I am on to you."
"How on to me?"
"Oh, you make me tired. I got your pal to-day. Look out I don't get you to-morrow."
The look of amazement on the man's face was a picture. Fred looked up at him and laughed. Then he turned away and went over across the street, as if to speak to the policeman there. The man hurried across Broadway, and was lost in the crowd surging along Park Row.
"That was a good scare you gave him, Fred," Bob said, as they walked on up the street.
"Yes. I knew it would be. I wouldn't tell him how I got onto his game. That's what he wanted to find out."
"You have got to look out for him after this."