Breaching the Perimeter

The gap beneath the front door called for immediate action. Dropping from the sneaker, I slid beneath the rubber weatherstrip into the vast exterior corridor. The floor stretched out in a disciplined grid of polished grey ceramic tiles. Ahead stood a tall, ribbed metal radiator, its vertical grates aligned in perfect symmetry. I advanced along the grout lines and took up a forward watch beside the metal base. The air is cool, and the corridor extends into uncharted territory.