learned that the missing man was devoted to entomology the identification was complete.

The darkness was rising, but much was still hidden by the shadows.

If this woman is in truth his wife, where does Mrs. Laura Lyons come in? I asked.

That is one of the points upon which your own researches have shed a light. Your interview with the lady has cleared the situation very much. I did not know about a projected divorce between herself and her husband. In that case, regarding Stapleton as an unmarried man, she counted no doubt upon becoming his wife.

And when she is undeceived?

Why, then we may find the lady of service. It must be our first duty to see her -- both of us -- to-morrow. Don't you think, Watson, that you are away from your charge rather long? Your place should be at Baskerville Hall.

The last red streaks had faded away in the west and night had settled upon the moor. A few faint stars were gleaming in a violet sky.

One last question, Holmes, I said, as I rose. Surely there is no need of secrecy between you and me. What is the meaning of it all? What is he after?

Holmes's voice sank as he answered:-- --

It is murder, Watson -- refined, cold-blooded, deliberate murder. Do not ask me for particulars. My nets are closing upon him, even as his are upon Sir Henry, and with your help he is