"By firing?"

"Yes."

"Let me walk as far as the corner with you."

"Very well, Mr. Brady. I have no objection to that."

The journey was made in utter silence, and the old detective noticed that
the shadowy men were following them.

When they reached the corner, Old King Brady glanced around, looking for
Harry, who agreed to meet him there.

The boy was nowhere in sight.

Old King Brady then coughed and dropped his handkerchief as a signal.

For a moment there was no notice paid to it, but presently he heard a
distant hissing sound of singular penetration.

It was an answer to his signal and meant that he was seen and understood.

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."