Chapter 28: The Proof That Logic Cannot Model

The footfall came again — closer now, and multiplied.

Watson did not turn. He watched Corvath's eyes instead, because Corvath's eyes were doing the work of calculating what the footsteps meant, and the calculation was visible in them the way water is visible through ice: the surface still, the movement beneath entirely legible to anyone who knew where to look.

Four men, Watson thought. Lestrade would bring four men. He had told Lestrade to bring none.