"Then I will take a walk in Washington Parade ground to-morrow at about eleven o'clock, and you shall meet me and I will lead you to my friend's room, and then and there we will complete all our arrangements. Yes, yes, I will save my brother and earn the money to start him out on an honest course."
"Your affection for your brother appears to be very great."
"It is. I idolize him."
"Then at eleven o'clock to-morrow we are to meet by chance."
"Yes."
Our hero and the siren separated. She said she was to meet her brother who was to accompany her to her home. The siren passed out ahead of our hero after a merry good-night. When Oscar came forth he had wrought a change. He stepped down to the curb and glanced. He saw a little chalk mark. It would have looked to an ordinary observer like a mere accidental scrape of chalk. To Oscar it spoke volumes, and he knew that his faithful strategist had succeeded in falling to a trail; and he knew that he would soon be on the trail like a sleuthhound following its prey. The detective started forward. At the first street corner he drew a little mask lantern and flashed its light around quickly and deftly, and there again under its glare he beheld a tiny chalk mark.
"Right," he muttered as he read his sign and moved on; and so he proceeded until he arrived at a certain corner, when he came to a halt; and a few moments later a messenger boy came up close to him and said in a low tone:
"She met her man."
"Well?"
"They went in that house across the street."