It required some little time for me to determine that my shadow was one of the "Japanese"; for it was a most intangible and elusive shadow. Whatever else I might think of these worthies, I could not deny that their ability to hang on a man's trail, and at the same time keep themselves well-nigh invisible, amounted positively to genius. With all my doubling back and lurking in doorways around corners, the fellow never came up to where I could get a good view of him.

Of course it occurred to me that here was a chance to attempt a capture. But was it? The fellow was so slippery and artful that I risked a greater chance of losing him altogether. And then, to capture one of the quintet—or whatever their number might be—would more likely than not merely serve as a warning for the ring-leader of the crowd. Doubtless I could drag nothing at all from the fellow, even though I did succeed in laying hands upon him. If he had been set to watch me he would continue to do so unless I scared him away. I resolved to let him alone for the time being; but the first thing I did after reaching Dr. De Breen's offices was to ring up headquarters and request the Captain to send a man to get on my shadow's trail.

The doctor gave me a bad half-hour. The instant he was through I hurried to a window to learn how events were progressing in the street. Before I had time to ascertain whether my shadow was still on duty, or whether the Central Office man had showed up, my whole attention was absorbed by the appearance of two familiar figures on the opposite side. They were Mr. Fluette and Alexander Burke, walking along together in the most intimate manner imaginable.

I glanced at my watch; it still lacked a minute or two of ten, the hour Mr. Fluette had jotted on his calendar along with the extraordinary memorandum. Inasmuch as he and his strangely chosen companion were moving rapidly, it was a reasonable assumption that he was even then on his way to keep his engagement.

For a moment I stood irresolute. I was very anxious to follow the twain to the rendezvous, while at the same time I did not want to lose my shadow. I glanced eagerly up and down the street, studying the hurrying crowd on the walk, but could not see him anywhere. Then I hurried out to the elevator, and within the next minute was dropped to the ground floor.

I was obliged to walk fast to get within range of Fluette and Burke again—not an easy thing to do among the crowd—but still I could see nothing of my headquarters man, nor of the Jap. And right then I perceived the last mentioned. He had manifestly only at that instant caught up with the speculator and his companion—though why I had failed to see him before I can't imagine—and he was evidently addressing one or the other, or both of them.

It seemed to me that the fellow was trying to make his presence as inconspicuous as possible. He strode stolidly along, close behind them, looking into the shop windows and apparently not noticing the two men at all. Yet I knew that he was talking to them. I could tell by the surprised way with which both Fluette and Burke swung round and stared at him.

I quickened my steps. Yes, the Oriental was talking, and talking volubly. And, if I might judge by the consternation and anger reflected in the faces of his two auditors, his message was anything but welcome. That is to say, Alfred Fluette's strong features showed these emotions, while, as always, it was difficult to read what was going on behind Burke's impassive mask. Still it was pretty plain that the secretary was utterly at his wits'-end.

At last the three stopped at a corner, where they moved up close to the building to avoid the rush of pedestrians. I dared not draw near enough to hope to hear any of their conversation; I could do no more than watch from a distance, trusting to their absorption to keep them oblivious of my proximity.

Both were now excitedly questioning the Jap, who seemed to be wholly unmoved by their agitation. Presently Fluette turned angrily upon Burke. From his manner it was not difficult to imagine that he was soundly berating the secretary, who, whenever he could make himself heard, was just as plainly attempting to present some extenuating argument.