O’Shea took from an inside pocket of his coat a leather bill-case and drew therefrom a sheet of heavy paper folded several times. Spread out, it covered half the desk. Upon it he had drawn with a brush and stencilling ink a life-size reproduction of the great Chinese character that scarred and discolored the back of the red-haired sailor.

Inspector Burke flung his cigarette aside with a quick gesture and stared first at the desk and then at O’Shea. His pleasant composure was evidently disturbed, and he spoke abruptly.

“My word! You know a lot more about this job than I do. Where the deuce did you get that? The poor beggar that was butchered last night had the mark on him.”

“I know he did, Inspector Burke. I was sure of it when I read about the thing in the newspaper this morning.”

They went into the shed and viewed what was left of the ill-fated McDougal, who had tried, too late, to throw all regrets away and make a new start at the difficult business of existence. O’Shea was keenly distressed. The man had won his sympathy. He would have liked to befriend him. Inspector Burke said kindly:

“Did you know him at all well? He must have amounted to something once. Was he ever a chum of yours?”

“I never laid eyes on him till last evening in Paddy Blake’s,” answered O’Shea. “And now I will sit down with ye and spin the yarn of the sailorman that I called Bill Maguire for convenience.”

The inspector listened gravely, nodding comprehendingly now and then as if his own experience might have crossed the trail of the same story. When O’Shea ceased talking, his comment was as follows:

“Most extraordinary! I fancy we can help each other a bit. But, mind you, I don’t pretend to know much about this mysterious murder society that goes about choppin’ people up. I have heard of it, of course, but until now its activities have been confined to the Chinese. We don’t pretend to police the native city. The Chinese governor runs his own show. There are native detectives on my staff, but their work is mostly in the foreign municipality. The case of this McDougal is the first of its kind. And I rather think you have supplied the motive. He knew too much.”

“But what did he know?” demanded O’Shea. “There was this sailor by the right name of Jim Eldridge, ye understand. He got his in the same way. They were mixed up together at one time or another.”