The more outre and grotesque an incident is the more carefully it deserves to be examined, and the very point which appears to complicate a case is, when duly considered and scientifically handled, the one which is most likely to elucidate it.
"Then we had the visit from our friends next morning, shadowed always by Stapleton in the cab.

From his knowledge of our rooms and of my appearance, as well as from his general conduct, I am inclined to think that Stapleton's career of crime has been by no means limited to this single Baskerville affair.

It is suggestive that during the last three years there have been four considerable burglaries in the West Country, for none of which was any criminal ever arrested.

The last of these, at Folkestone Court, in May, was remarkable for the cold-blooded pistoling of the page, who surprised the masked and solitary burglar.

I cannot doubt that Stapleton recruited his waning resources in this fashion, and that for years he has been a desperate and dangerous man.
"We had an example of his readiness of resource that morning when he got away from us so successfully, and also of his audacity in sending back my own name to me through the cabman.