Later came the comforting thought that, as she had got to the roof though the door had been shut, she would be able to get away by the same means.

She had evidently knowledge of some secret way into the Castle.

The alternative was that she must have some supernatural quality or faculty which gave her strange powers.

I did not wish to pursue that train of thought, and so, after an effort, shut it out from my mind.
When I got back to my room I locked the door behind me, and went to sleep in the dark.

I did not want light just then--could not bear it.
This morning I woke, a little later than usual, with a kind of apprehension which I could not at once understand.