With a satisfied feeling the old detective now said to the veiled woman:
"I shall leave you here. Don't think I am ungrateful for your kindness. On the contrary, I appreciate it very much. But my duty compels me to pay no heed to your valuable warning. I must run down my quarry. Good-night, madam."
He tipped his hat and strode away to the Walker House, where he was staying.
She stood watching him until he was several blocks distant and then gave vent to a low, peculiar whistle.
Instantly four men came gliding from the shadows, and grouped around her, as she started to walk away.
She was heading for the railroad depot.
When she was gone, Harry Brady slid down from the dense foliage of a nearby tree where he had been a hidden watcher.
The boy had seen the woman and her body-guard, and knew that his partner wanted him to shadow her from that point.
Accordingly he glided along after them.