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 “On observing the cab I should have instantly turned and walked in the other direction. I should then at my leisure have hired a second cab and followed the first at a respectful distance, or, better still, have driven to the Northumberland Hotel and waited there. When our unknown had followed Baskerville home we should have had the opportunity of playing his own game upon himself, and seeing where he made for. As it is, by an indiscreet eagerness, which was taken advantage of with extraordinary quickness and energy by our opponent, we have betrayed ourselves and lost our man.”

We had been sauntering slowly down Regent Street during this conversation, and Dr. Mortimer, with his companion, had long vanished in front of us.

“There is no object in our following them,” said Holmes. “The shadow has departed and will not return. We must see what further cards we have in our hands, and play them with decision. Could you swear to that man’s face within the cab?”