I knew what it was, what it had to be. I recognised the signs. A psychenaut; a traveller from some higher or lower dimension. An intruder that could not be stopped or turned aside because it was either too real or not real enough to be affected by human powers. I'd had some experience with psychenauts, back when I apprenticed with old Carnacki, the Ghost Finder. It didn't seem fair that I should have to face something so awful twice in one lifetime. I would have run, but I knew I'd never make it.

The crowd was already beginning to panic when the first protrusions from a lower dimension began to manifest. Unfocussed energies sleeted through the Hall, sparking black rainbows and shimmering auras around people who weren't actually there, before sinking into physical objects and lending them a horrible animation. Ugly, distorted faces formed themselves out of the materials of the walls, floor, and ceiling. Thick lips curled back to reveal jagged teeth, while dark eyes rolled grinding in their sockets, and abhuman voices shuddered through our heads, saying We are coming, we are coming. The wooden fingertips of a huge hand thrust slowly up from among the rows of seats, and the crowd scattered, shrieking and screaming, and shouting Words of Power that had no influence on what was forcing its way into our world from the underpinnings of reality.

The cheap wooden seats suddenly exploded into lashing wooden tentacles, springing out to wrap themselves around the fleeing crowd, holding them tightly. More screams rose as arms and legs broke under the inhuman pressure of the wooden bonds. Great faces in the floor drank up the spilled blood, making noises thick with meaning that pre-dated language. The walls were swelling in and out, as though in rhythm to some great thing breathing, and the whole Hall shook, the floor rising and falling like a ship at sea.

Poltergeist activity stormed all around us. Events were happening so fast now no-one could react quick enough to keep up with them. Any object left unsecured flew violently back and forth, or spontaneously combusted. Clothes grew too large, or ripped and tore as they shrank. Fires burned unsupported on the air, and beads of sweat rolled sluggishly up the walls. There were hails of stones and rains of fish, and people spoke in unknown tongues.

I fought my way through the chaos to grab hold of Lucretia Grave, who was on her knees and clinging numbly to her rocking podium. I hauled her back onto her feet, and she clung to me like a child. I had hoped she'd have some emergency backup magics she could call on, but it didn't look like it. The teddy bears were staggering back and forth among the panicking crowd, trying to help, but there was little they could do except try and shield people with their padded bodies.

A genius loci invaded the Hall, overpowering and supplanting the old Barn's actual ambience, and, immediately, powerful emotions stormed our minds, slapping aside our defences with contemptuous ease. People began laughing, crying, and howling with an hysteria that shook them the way a dog shakes a rat. I was laughing so hard I hurt, but I couldn't stop. And then the horrors swept through us all, the same basic fears; of the dark, of falling, of people not being who we thought they were. People struck out at each other because they had to strike out at something. Men and women fell down and did not rise again, forced into catatonia by terrors and emotions they couldn't face. There was a new genius loci in residence, and the Great Auction Hall had become an alien, unbearable place. A few people staggered towards the exits, only to find that the doors had disappeared. There was no way out any more.