“This is a very obvious way of limiting our field of operations,” said Holmes. “No doubt Baynes, with his methodical mind, has already adopted some similar plan.”

“I don’t quite understand.”

“Well, my dear fellow, we have already arrived at the conclusion that the message received by Garcia at dinner was an appointment or an assignation. Now, if the obvious reading of it is correct, and in order to keep this tryst one has to ascend a main stair and seek the seventh door in a corridor, it is perfectly clear that the house is a very large one. It is equally certain that this house cannot be more than a mile or two from Oxshott, since Garcia was walking in that direction and hoped, according to my reading of the facts, to be back in Wisteria Lodge in time to avail himself of an alibi, which would only be valid up to one o’clock. As the number of large houses close to Oxshott must be limited, I adopted the obvious method of sending to the agents mentioned by Scott Eccles and obtaining a list of them. Here they are in this telegram, and the other end of our tangled skein must lie among them.”

It was nearly six o’clock before we found ourselves in the pretty Surrey village of Esher, with Inspector Baynes as our companion.

Holmes and I had taken things for the night, and found comfortable quarters at the Bull. Finally we set out in the company of the detective on our visit to Wisteria Lodge. It was a cold, dark March evening, with a sharp wind and a fine rain beating upon our faces, a fit setting for the wild common over which our road passed and the tragic goal to which it led us.