Thorndyke looked at me in surprise. "I don't know what you would have, Jervis, unless you expect casual strangers to present you with a ready-made body of evidence, fully classified, with all the inferences and implications stated. It seemed to me that he was a highly instructive young man."
"What did you learn from him?" I asked.
"Oh, come, Jervis," he protested; "is that a fair question, under our present arrangement? However, I will mention a few points. We learn that about six or seven months ago, Mr. H. Weiss dropped from the clouds into Kennington Lane and that he has now ascended from Kennington Lane into the clouds. That is a useful piece of information. Then we learn that Mrs. Schallibaum has remained in England; which might be of little importance if it were not for a very interesting corollary that it suggests."
"What is that?"
"I must leave you to consider the facts at your leisure; but you will have noticed the ostensible reason for her remaining behind. She is engaged in puttying up the one gaping joint in their armor. One of them has been indiscreet enough to give this address to some correspondent—probably a foreign correspondent. Now, as they obviously wish to leave no tracks, they cannot give their new address to the post-office to have their letters forwarded, and, on the other hand, a letter left in the box might establish such a connection as would enable them to be traced. Moreover, the
