“We may form some conception as to the motives of the crime. It is, as I gather from your original remarks, an inexplicable, or at least an unexplained, murder. Now, presuming that the source of the crime is as we suspect it to be, there might be two different motives. In the first place, I may tell you that Moriarty rules with a rod of iron over his people. His discipline is tremendous. There is only one punishment in his code. It is death. Now we might suppose that this murdered man—this Douglas whose approaching fate was known by one of the arch-criminal’s subordinates—had in some way betrayed the chief. His punishment followed, and would be known to all—if only to put the fear of death into them.”
“Well, that is one suggestion, Mr. Holmes.”
“The other is that it has been engineered by Moriarty in the ordinary course of business. Was there any robbery?”
“I have not heard.”
“If so, it would, of course, be against the first hypothesis and in favour of the second. Moriarty may have been engaged to engineer it on a promise of part spoils, or he may have been paid so much down to manage it. Either is possible. But whichever it may be, or if it is some third combination, it is down at Birlstone that we must seek the solution. I know our man too well to suppose that he has left anything up here which may lead us to him.”