Read it through once

I stood with my lamp held out over the stair-rail, and he came slowly within its light. It was a shaded lamp, to shine upon a book, and its circle of light was very contracted; so that he was in it for a mere instant, and then out of it. In the instant, I had seen a face that was strange to me, looking up with an incomprehensible air of being touched and pleased by the sight of me.