The "zone of danger", as the _Bulletin_ named it, was immediately the scene of swarming activities. Besides the expedition immediately despatched by the interests backing the investigation, several enterprising newspapers saw a fine chance for a big scoop, and sent out much-heralded parties of their own. The activities of these were well reported, you may be sure. Public interest was at once focused reassuringly on the chances of finding the annoying malefactor to-day or to-morrow; there no longer existed a doubt that he would be found. The weight of dread was lifted, and in the reaction people made light of the inconveniences and fun of the menacing messages that now came in by the dozen.

It was necessary to take extraordinary precautions against thieves and fire; the people took them. It was needful to slacken business in order that the congestion of the rush hour might not again prove tragic; business was slackened. People were willing to undergo many things, because, after all, they were but temporary. The madman of the Catskills would sooner or later be found; his pernicious activities brought to a conclusion. The country to be searched was tremendous, of course, but the search was thorough.

The public delivered itself joyously to a debauch of rumors and of "extras". The insistent alarms of danger, trickling in slowly from the outside world, dried up in the warmth of optimism. Only the more thoughtful, to a few of whom these warnings came, coupled them with Monsieur X's repeated threats, and walked uncertain and in humility.

Percy Darrow did not interest himself in the search, nor did he desert his post in the wireless office. There he did nothing whatever. Jack Warford stayed with him, but immensely bored, it must be confessed. Once he suggested that if Darrow had nothing for him to do that afternoon, he thought he would like to go out for a little exercise.

Darrow shook his head.

"You may go, if you want to, Jack," said he, "but if you do I'll have to get some one else. This isn't much of a job, but I may need you any moment."

"All right," agreed Jack cheerfully. "Only I wish you'd let a fellow know what to expect."

Darrow shook his head. The two now practically lived in the office. Neither had taken his clothes off for several days. They slept in their chairs or on the lounge. Darrow read the various messages from the Unknown, glanced over the newspapers, and dozed.

Thus there passed two days of the search. On the third day the intermittent phenomena and the messages suddenly ceased. This fact was hailed jubilantly by all the papers as indicating that at last the quarry had become alarmed by the near-coming search. From the contracted district still remaining to be combed over, nobody was permitted to depart; and so closely was the cordon drawn by so large a posse that it was physically impossible for any living being to slip by the line.

Thus even if Monsieur X, convinced that at last his discovery was imminent, should destroy his apparatus or attempt to move it and himself to a place of safety, he would find his escape cut off. Thousands of men were employed, and thousands more drafted in ............