The promise of adventure had always a fascination for me, and I was complimented by the words of Holmes and by the eagerness with which the baronet hailed me as a companion.

“I will come, with pleasure,” said I. “I do not know how I could employ my time better.”

“And you will report very carefully to me,” said Holmes. “When a crisis comes, as it will do, I will direct how you shall act. I suppose that by Saturday all might be ready?”

“Would that suit Dr. Watson?”

“Perfectly.”

“Then on Saturday, unless you hear to the contrary, we shall meet at the ten-thirty train from Paddington.”

We had risen to depart when Baskerville gave a cry of triumph, and diving into one of the corners of the room he drew a brown boot from under a cabinet.

“My missing boot!” he cried.

“May all our difficulties vanish as easily!” said Sherlock Holmes.

“But it is a very singular thing,” Dr. Mortimer remarked. “I searched this room carefully before lunch.”

“And so did I,” said Baskerville. “Every inch of it.”

“There was certainly no boot in it then.”

“In that case the waiter must have placed it there while we were lunching.”

The German was sent for but professed to know nothing of the matter, nor could any inquiry clear it up. Another item had been added to that constant and apparently purposeless series of small mysteries which had succeeded each other so rapidly. Setting aside the whole grim story of Sir Charles’s death, we had a line of inexplicable incidents all within the limits of two days, which included the receipt of the printed letter, the black-bearded spy in the hansom, the loss of the new brown boot, the loss of the old black boot, and now the return of the new brown boot. Holmes sat in silence in the cab as we drove back to Baker Street, and I knew from his drawn brows and keen face that his mind, like my own, was busy in endeavouring to frame some scheme into which all these strange and apparently disconnected episodes could be fitted. All afternoon and late into the evening he sat lost in tobacco and thought.

Just before dinner two telegrams were handed in. The first ran:

Have just heard that Barrymore is at the Hall.
BASKERVILLE.

The second:

Visited twenty-three hotels as directed, but sorry to report unable to trace cut sheet of Times.
CARTWRIGHT.

“There go two of my threads, Watson. There is nothing more stimulating than a case where everything goes against you. We must cast round for another scent.”

“We have still the cabman who drove the spy.”

“Exactly. I have wired to get his name and address from the Official Registry. I should not be surprised if this were an answer to my question.”

The ring at the bell proved to be something even more satisfactory than an answer, however, for the door opened and a rough-looking fellow entered who was evidently the man himself.

“I got a message from the head office that a gent at this address had been inquiring for No. 2704,” said he. “I’ve driven my cab this seven years and never a word of complaint. I came here straight from the Yard to ask you to your face what you had against me.”

“I have nothing in the world against you, my good man,” said Holmes. “On the contrary, I have half a sovereign for you if you will give me a clear answer to my questions.”

“Well, I’ve had a good day and no mistake,” said the cabman with a grin. “What was it you wanted to ask, sir?”

“First of all your name and address, in case I want you again.”

“John Clayton, 3 Turpey Street, the Borough. My cab is out of Shipley’s Yard, near Waterloo Station.”

Sherlock Holmes made a note of it.