A woman had hastily descended the steps, evidently seeing her opportunity to escape while we were in the back of the house. She had reached the street door, which now was open, and the flaming arc light in front of the house shone brightly on her.

I looked, expecting to see our dark-haired, olive-skinned Marie. I stared in amazement. Instead, this woman was fair, her hair was flaxen, her figure more slim, even her features were different. She was a stranger. I could not recollect ever having seen her.

Again I strained my eyes, thinking it might be Betty Blackwell at last, but this woman bore no resemblance apparently to her. She looked older, more mature.

In my haste I noted that she had a bandage about her face, as if she had been injured recently, for there seemed to be blood on it where it had worked itself loose in her flight. She gave one glance at us, and quickened her pace at seeing us so close. The bandage, already loose, slipped off her face and fell to the floor. Still she did not seem other than a stranger to me, though I had a half-formed notion that I had seen that face somewhere before. She did not stop to pick the bandage up. She had gained the door and was down the front step on the sidewalk before we could stop her.

Taxicabs in droves seemed to have collected, like buzzards over a dead body. They were doing a thriving business carrying away those who sought to escape. Into one by which a man was waiting in the shadow the woman hurried. The man looked for all the world like Dr. Harris. An instant later the chauffeur was gone.

The policeman had the front door of Madame Margot's covered all right, so efficiently that he was neglecting everything else. From the basement now and then a scurrying figure catapulted itself out and was lost in the curious crowd that always collects at any time of day or night on a New York street when there is any excitement.

"It is of no use to expect to capture anyone now," exclaimed Craig, as we hurried back into the dope joint. "I hardly expected to do it. All I panted was to protect Miss Kendall. But we have the evidence against this joint that will close it for good."

He stooped and picked up the bandage.

"I think I'll keep that," he remarked thoughtfully. "I wonder what that blonde woman wore that for?"

"She MUST be up there," reiterated Clare, who had followed us. "I heard them talking, it seemed to me only the moment before I heard you in the hall."