The Sergeant asked if Rosanna Spearman had returned.Yes.

When?
Nearly an hour since.

What had she done?
She had gone up-stairs to take off her bonnet and cloak--and she was now at supper quietly with the rest.
Without making any remark, Sergeant Cuff walked on, sinking lower and lower in his own estimation, to the back of the house.

Missing the entrance in the dark, he went on (in spite of my calling to him) till he was stopped by a wicket-gate which led into the garden.

When I joined him to bring him back by the right way, I found that he was looking up attentively at one particular window, on the bed-room floor, at the back of the house.
Looking up, in my turn, I discovered that the object of his contemplation was the window of Miss Rachel's room, and that lights were passing backwards and forwards there as if something unusual was going on.
"Isn't that Miss Verinder's room ?" asked Sergeant Cuff.
I replied that it was, and invited him to go in with me to supper.