The Gap in the Curtain by John Buchan

We drifted to the library, and dropped into chairs on each side of the hearth. It was a chilly night, so the fire had been kept high, and the room was so arranged that the light was concentrated around where we sat, and the rest left in shadow. So I had a good view of Goodeve's face against a dusky background. He had lit a pipe, and was staring at the logs, his whole body relaxed like a tired man's. But I caught him casting furtive glances in my direction. He wanted to tell me something; perhaps he saw that I had guessed, and wanted me to ask a question, but I felt oddly embarrassed and waited.

He spoke first.