Would these new-found, strangely-given powers of his suffice to protect her?
If not, he would have but little use for them, since she was his nearest and dearest on earth.
He pulled his stockings over the pants of his pyjamas and put on his velvet working jacket, forgetting for the moment that, if these things were true, it would be perfectly easy for him to make himself invisible to beings in the ordinary world of three dimensions.

Then he turned out the light, opened the door very softly, and crept downstairs.
Yes, what he had seen was true.

He heard the soft, shuffling patter of stockinged feet along the landing, though he could see nothing in the dark.

A door opened gently.

His sense of location told him that it was the door of the spare bedroom next but one to the study.