"If I was a mouse I could fit through that hole," he reasoned, turning the brush on himself. The liquid latex soaked into his clothing, making him shiver. The brush seemed to respond to his desires and in hardly any time at all, Lucas was gone and a small, shiny, brown mouse stood in his place. It stared at its little pink paws in disbelief and twitched its whiskers in dismay as it looked up at the vast, cathedral-like room.
The torch lay on the floor nearby, casting its light over the brush that had fallen from Lucas' hands as the magical rubber spread over his body and the transformation took on a momentum of its own. The mouse hurried over to the brush now, gripping a bundle of the bristles in its teeth.
"Nggh! Too heavy to move!" Lucas thought, his paws scrapping against the floorboards as he strained his whole body. The brush didn't even budge. "I'll have to leave it behind. Ah well, I can always come back for it."
Moving out of the light of the torch, he discovered his night vision had been enhanced, allowing him to see the room in much more detail. As he scampered beneath one of the benches, he found more bones, the flesh long since rotten off or eaten by mice like himself, still loosely contained in the shredded rags that they'd died in. Some of the bones looked odd, and one skull even had a perfectly round, smooth hole in the back of it. Evidently the scientists had been using the brush to "dissect" themselves while still alive. No wonder the church had got creeped out.
Lucas clambered over a femur, out across the floorboards, then up a pile of rubble and into the hole in the crumbling brickwork of the wall, which now rose like a cavern around him. Inside the pitch blackness of the wall cavity, even his sensitive mouse eyes could perceive nothing and he found himself being guided by his whiskers as they brushed against the walls of the narrow passageway, and by his instincts which were automatically leading him towards the fresher air. The tunnel twisted and turned, following a winding route through the remains of several old mice burrows.
Finally, when he was well and truly lost, the tunnel came to a split. His nose was telling him to go right, that something delicious lay down the right split of the tunnel, while danger lurked down the left.
He decided to turn...