“No, no, the mystery!” I cried.

“Oh, that! I thought of the salt that I have been working upon. There was never any mystery in the matter, though, as I said yesterday, some of the details are of interest. The only drawback is that there is no law, I fear, that can touch the scoundrel.”

“Who was he, then, and what was his object in deserting Miss Sutherland?”

The question was hardly out of my mouth, and Holmes had not yet opened his lips to reply, when we heard a heavy footfall in the passage and a tap at the door.

“This is the girl’s stepfather, Mr. James Windibank,” said Holmes. “He has written to me to say that he would be here at six. Come in!”