A look of devilish satisfaction broke out on her face, and she left the room quickly and quietly, without exchanging a word with any of us.

I saw this, and it aroused my suspicions.

There is no need to mention what they were, for, as events soon showed, they were entirely wide of the mark.
Having come to myself a little, I sent them all out of the room except the coachman.

We two then examined the place.
The Red Room was usually occupied by visitors.

It was on the ground floor, and looked out into the garden.