“Undoubtedly I do. That is to say, I intend to convert the locality of this house into a definite address; which, I think, will now be perfectly easy, unless we should have the bad luck to find more than one covered way. Even then, the difficulty would be trifling.”

“And when you have ascertained where Mr. Weiss lives? What then?”

“That will depend on circumstances. I think we shall probably call at Scotland Yard and have a little talk with our friend Mr. Superintendent Miller; unless, for any reason, it seems better to look into the case ourselves.”

“When is this voyage of exploration to take place?”

Thorndyke considered this question, and, taking out his pocketbook, glanced through his engagements.