I followed him with a dour face.  Very clearly I could see in my mind’s eye that shattered figure on the floor.  Here within a few hours of the tragedy were his wife and his nearest friend laughing together behind a bush in the garden which had been his.  I greeted the lady with reserve.  I had grieved with her grief in the dining-room.  Now I met her appealing gaze with an unresponsive eye.

“I fear that you think me callous and hard-hearted.” said she.

I shrugged my shoulders.  “It is no business of mine,” said I.

“Perhaps some day you will do me justice.  If you only realized —­”

“There is no need why Dr. Watson should realize,” said Barker quickly.  “As he has himself said, it is no possible business of his.”

“Exactly,” said I, “and so I will beg leave to resume my walk.”

“One moment, Dr. Watson,” cried the woman in a pleading voice.  “There is one question which you can answer with more authority than anyone else in the world, and it may make a very great difference to me.  You know Mr. Holmes and his relations with the police better than anyone else can.  Supposing that a matter were brought confidentially to his knowledge, is it absolutely necessary that he should pass it on to the detectives?”

“Yes, that’s it,” said Barker eagerly.  “Is he on his own or is he entirely in with them?”

“I really don’t know that I should be justified in discussing such a point.”

“I beg —­ I implore that you will, Dr. Watson!  I assure you that you will be helping us —­ helping me greatly if you will guide us on that point.”

There was such a ring of sincerity in the woman’s voice that for the instant I forgot all about her levity and was moved only to do her will.

“Mr. Holmes is an independent investigator,” I said.  “He is his own master, and would act as his own judgment directed.  At the same time, he would naturally feel loyalty towards the officials who were working on the same case, and he would not conceal from them anything which would help them in bringing a criminal to justice.  Beyond this I can say nothing, and I would refer you to Mr. Holmes himself if you wanted fuller information.”

So saying I raised my hat and went upon my way, leaving them still seated behind that concealing hedge.  I looked back as I rounded the far end of it, and saw that they were still talking very earnestly together, and, as they were gazing after me, it was clear that it was our interview that was the subject of their debate.

“I wish none of their confidences,” said Holmes, when I reported to him what had occurred.  He had spent the whole afternoon at the Manor House in consultation with his two colleagues, and returned about five with a ravenous appetite for a high tea which I had ordered for him.  “No confidences, Watson; for they are mighty awkward if it comes to an arrest for conspiracy and murder.”

“You think it will come to that?”