Book of the Apocalypse
It's dark. An oppressive silence prevails. Only to those who live close to the ground, a loud rhythmic noise can be heard. This is of course exclusive for those like mice and creatures much smaller. Creatures with a good sense of hearing. To a cat or a dog it might still be audible, though they would probably only hear a soft tapping. Something tapping across the floor at an almost unearthly speed. Driven by something unknown to any breathing kind.