one which presented some very perplexing and extraordinary features. That’s absolutely all we have at present, Mr. Holmes.”

“Then, with your permission, we will leave it at that, Mr. Mac. The temptation to form premature theories upon insufficient data is the bane of our profession. I can see only two things for certain at present—a great brain in London, and a dead man in Sussex. It’s the chain between that we are going to trace.”