I hardly knew what to say to this.  The more I saw of Sergeant Cuff, the better I liked him.  My lady rallied a little after having opened her heart to me—­being, naturally, a woman of a high courage, as I have already told you.

“If I must see him, I must,” she said.  “But I can’t prevail on myself to see him alone.  Bring him in, Gabriel, and stay here as long as he stays.”

This was the first attack of the megrims that I remembered in my mistress since the time when she was a young girl.  I went back to the “boudoir.”  Mr. Franklin strolled out into the garden, and joined Mr. Godfrey, whose time for departure was now drawing near.  Sergeant Cuff and I went straight to my mistress’s room.

I declare my lady turned a shade paler at the sight of him!  She commanded herself, however, in other respects, and asked the Sergeant if he had any objection to my being present.  She was so good as to add, that I was her trusted adviser, as well as her old servant, and that in anything which related to the household I was the person whom it might be most profitable to consult.  The Sergeant politely answered that he would take my presence as a favour, having something to say about the servants in general, and having found my experience in that quarter already of some use to him.  My lady pointed to two chairs, and we set in for our conference immediately.

“I have already formed an opinion on this case,” says Sergeant Cuff, “which I beg your ladyship’s permission to keep to myself for the present.  My business now is to mention what I have discovered upstairs in Miss Verinder’s sitting-room, and what I have decided (with your ladyship’s leave) on doing next.”

He then went into the matter of the smear on the paint, and stated the conclusions he drew from it—­just as he had stated them (only with greater respect of language) to Superintendent Seegrave.  “One thing,” he said, in conclusion, “is certain.  The Diamond is missing out of the drawer in the cabinet.  Another thing is next to certain.  The marks from the smear on the door must be on some article of dress belonging to somebody in this house.  We must discover that article of dress before we go a step further.”

“And that discovery,” remarked my mistress, “implies, I presume, the discovery of the thief?”

“I beg your ladyship’s pardon—­I don’t say the Diamond is stolen.  I only say, at present, that the Diamond is missing.  The discovery of the stained dress may lead the way to finding it.”

Her ladyship looked at me.  “Do you understand this?” she said.

“Sergeant Cuff understands it, my lady,” I answered.

“How do you propose to discover the stained dress?” inquired my mistress, addressing herself once more to the Sergeant.  “My good servants, who have been with me for years, have, I am ashamed to say, had their boxes and rooms searched already by the other officer.  I can’t and won’t permit them to be insulted in that way a second time!”