A professional case of great gravity was engaging my own attention at the
time, and the whole of next day I was busy at the bedside of the sufferer.
It was not until close upon six o'clock that I found myself free, and was
able to spring into a hansom and drive to Baker Street, half afraid that I
might be too late to assist at the _dénouement_ of the little mystery. I
found Sherlock Holmes alone, however, half asleep, with his long, thin
form curled up in the recesses of his armchair. A formidable array of
bottles and test-tubes, with the pungent, cleanly smell of hydrochloric
acid, told me that he had spent his day in the chemical work which was so
dear to him.

"Well, have you solved it?" I asked as I entered.

"Yes. It was the bisulphate of baryta."

"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