The Return by Walter de la Mare — Read

But the coolness and deliberation of his scrutiny, had to a certain extent calmed Lawford's mind and given him confidence. Hitherto he had met the little difficulties of life only to vanquish them with ease and applause. Now he was standing face to face with the unknown. He burst out laughing, into a long, low, helpless laughter. Then he arose and began to walk softly, swiftly, to and fro across the room -- from wall to wall seven paces, and at the fourth, that awful, unseen, brightly-lit profile passed as swiftly over the tranquil surface of the looking-glass. The power of concentration was gone again. He simply paced on mechanically, listening to a Babel of questions, a conflicting medley of answers. But above all the confusion and turmoil of his brain, as a boatswain's whistle rises above a storm, so sounded that same infinitesimal voice, incessantly repeating another question now, "What are you going to do? What are you going to do?"

And in the midst of this confusion, out of the infinite, as it were, came another sharp tap at the door, and all within sank to utter stillness again.