cigarette was alight or not. They were well into the main road again
before Bell spoke.

"It is pretty evident that you and I are on the same track," he said.

"I am certain that I am on the right one," David replied; "but, when I
come to consider the thing calmly, it seems more by good luck than
anything else. I came out with you to-night seeking adventure, and I am
bound to admit that I found it. Also, I found the lady who interviewed me
in the darkness, which is more to the point."

"As a matter of fact, you did nothing of the kind," said Bell, with the
suggestion of a laugh.

"Oh! Case of the wrong room over again. I was ready to swear it. Whom did
I speak to? Whose voice was it that was so very much like hers?"

"The lady's sister. Enid Henson was not at 218, Brunswick Square, on
the night in question. Of that you may be certain. But it's a queer
business altogether. Rascality I can understand. I am beginning to
comprehend the plot of which I am the victim. But I don't mind
admitting that up to the present I fail to comprehend why those girls
evolved the grotesque scheme for getting assistance at your hands. The
whole thing savours of madness."

"I don't think so," David said, thoughtfully. "The girls are romantic as
well as clever. They are bound together by the common ties of a common
enmity towards a cunning and utterly unscrupulous scoundrel. By the
merest accident in the world they discovered that I am in a position to
afford them valuable advice and assistance. At the same time they don't