The father strode across the room in a sudden access of rage.

“He's thinking of that woman,” he cried out, in a loud voice. “He's trying to shield her.”

“He's a loyal kid, at that,” Burke commented, with a grudging admiration. “I'll say that much for him.” His expression grew morose, as again he pressed the button on his desk. “And now,” he vouchsafed, “I'll show you the difference.” Then, as the doorman reappeared, he gave his order: “Dan, have the Turner woman brought up.” He regarded the two men with his bristling brows pulled down in a scowl. “I'll have to try a different game with her,” he said, thoughtfully. “She sure is one clever little dame. But, if she didn't do it herself, she knows who did, all right.” Again, Burke's voice took on its savage note. “And some one's got to pay for killing Griggs. I don't have to explain why to Mr. Demarest, but to you, Mr. Gilder. You see, it's this way: The very foundations of the work done by this department rest on the use of crooks, who are willing to betray their pals for coin. I told you a bit about it last night. Now, you understand, if Griggs's murder goes unpunished, it'll put the fear of God into the heart of every stool-pigeon we employ. And then where'd we be? Tell me that!”

The Inspector next called his stenographer, and gave explicit directions. At the back of the room, behind the desk, were three large windows, which opened on a corridor, and across this was a tier of cells. The stenographer was to take his seat in this corridor, just outside one of the windows. Over the windows, the shades were drawn, so that he would remain invisible to any one within the office, while yet easily able to overhear every word spoken in the room.

When he had completed his instructions to the stenographer, Burke turned to Gilder and Demarest.

“Now, this time,” he said energetically, “I'll be the one to do the talking. And get this: Whatever you hear me say, don't you be surprised. Remember, we're dealing with crooks, and, when you're dealing with crooks, you have to use crooked ways.”

There was a brief period of silence. Then, the door opened, and Mary Turner entered the office. She walked slowly forward, moving with the smooth strength and grace that were the proof of perfect health and of perfect poise, the correlation of mind and body in exactness. Her form, clearly revealed by the clinging evening dress, was a curving group of graces. The beauty of her face was enhanced, rather than lessened, by the pallor of it, for the fading of the richer colors gave to the fine features an expression more spiritual, made plainer the underlying qualities that her accustomed brilliance might half-conceal. She paid absolutely no attention to the other two in the room, but went straight to the desk, and there halted, gazing with her softly penetrant eyes of deepest violet into the face of the Inspector.

Under that intent scrutiny, Burke felt a challenge, set himself to match craft with craft. He was not likely to undervalue the wits of one who had so often flouted him, who, even now, had placed him in a preposterous predicament by this entanglement over the death of a spy. But he was resolved to use his best skill to disarm her sophistication. His large voice was modulated to kindliness as he spoke in a casual manner.

“I just sent for you to tell you that you're free.”

Mary regarded the speaker with an impenetrable expression. Her tones as she spoke were quite as matter-of-fact as his own had been. In them was no wonder, no exultation.