In the second (as you shall presently judge), Mr.Seegrave was fast approaching the condition of a superintendent at his wits' end.
Having ferreted about all over the "boudoir," without making any discoveries among the furniture, our experienced officer applied to me to know, whether the servants in general were or were not acquainted with the place in which the Diamond had been put for the night.
"I knew where it was put, sir," I said, "to begin with.

Samuel, the footman, knew also--for he was present in the hall, when they were talking about where the Diamond was to be kept that night.

My daughter knew, as she has already told you.

She or Samuel may have mentioned the thing to the other servants--or the other servants may have heard the talk for themselves, through the side-door of the hall, which might have been open to the back staircase.

For all I can tell, everybody in the house may have known where the jewel was, last night." My answer presenting rather a wide field for Mr.Superintendent's suspicions to range over, he tried to narrow it by asking about the servants' characters next.
I thought directly of Rosanna Spearman.