Down each façade a stairway fell, broken by small landings on which a door opened; they dropped to a broad ledge of greyish stone edging the lip of this midnight pool and upon it also fell two wide flights from either side of the bridge platform. Along all four stairways the guards were ranged; and here and there against the ledge stood the shells⁠—in a curiously comforting resemblance to parked motors in our own world.

The sombre walls bulked high; curved and ended in two obelisked pillars from which, like a tremendous curtain, stretched a barrier of that tenebrous gloom which, though weightless as shadow itself, I now knew to be as impenetrable as the veil between life and death. In this murk, unlike all others I had seen, I sensed movement, a quivering, a tremor constant and rhythmic; not to be seen, yet caught by some subtle sense; as though through it beat a swift pulse of⁠—black light.