“And as you value your life do not go across the moor in any direction save along the straight path which leads from Merripit House to the Grimpen Road, and is your natural way home.”

“I will do just what you say.”

“Very good. I should be glad to get away as soon after breakfast as possible, so as to reach London in the afternoon.”

I was much astounded by this programme, though I remembered that Holmes had said to Stapleton on the night before that his visit would terminate next day. It had not crossed my mind, however, that he would wish me to go with him, nor could I understand how we could both be absent at a moment which he himself declared to be critical. There was nothing for it, however, but implicit obedience; so we bade good-bye to our rueful friend, and a couple of hours afterwards we were at the station of Coombe Tracey and had dispatched the trap upon its return journey. A small boy was waiting upon the platform.

“Any orders, sir?”

“You will take this train to town, Cartwright. The moment you arrive you will send a wire to Sir Henry Baskerville, in my name, to say that if he finds the pocketbook which I have dropped he is to send it by registered post to Baker Street.”

“Yes, sir.”

“And ask at the station office if there is a message for me.”

The boy returned with a telegram, which Holmes handed to me. It ran:

Wire received. Coming down with unsigned warrant. Arrive five-forty.

LESTRADE.

“That is in answer to mine of this morning. He is the best of the professionals, I think, and we may need his assistance. Now, Watson, I think that we cannot employ our time better than by calling upon your acquaintance, Mrs. Laura Lyons.”

His plan of campaign was beginning to be evident. He would use the baronet in order to convince the Stapletons that we were really gone, while we should actually return at the instant when we were likely to be needed. That telegram from London, if mentioned by Sir Henry to the Stapletons, must remove the last suspicions from their minds. Already I seemed to see our nets drawing closer around that lean-jawed pike.

Mrs. Laura Lyons was in her office, and Sherlock Holmes opened his interview with a frankness and directness which considerably amazed her.

“I am investigating the circumstances which attended the death of the late Sir Charles Baskerville,” said he. “My friend here, Dr. Watson, has informed me of what you have communicated, and also of what you have withheld in connection with that matter.”

“What have I withheld?” she asked defiantly.

“You have confessed that you asked Sir Charles to be at the gate at ten o’clock. We know that that was the place and hour of his death. You have withheld what the connection is between these events.”

“There is no connection.”

“In that case the coincidence must indeed be an extraordinary one. But I think that we shall succeed in establishing a connection, after all. I wish to be perfectly frank with you, Mrs. Lyons. We regard this case as one of murder, and the evidence may implicate not only your friend Mr. Stapleton but his wife as well.”

The lady sprang from her chair.

“His wife!” she cried.

“The fact is no longer a secret. The person who has passed for his sister is really his wife.”

Mrs. Lyons had resumed her seat. Her hands were grasping the arms of her chair, and I saw that the pink nails had turned white with the pressure of her grip.

“His wife!” she said again. “His wife! He is not a married man.”

Sherlock Holmes shrugged his shoulders.

“Prove it to me! Prove it to me! And if you can do so- -!” The fierce flash of her eyes said more than any words.