Sophie had expected to discover another subway station with battered and impersonal-looking halls, or perhaps another crowded corridor. Nothing, however, had prepared her for what she found on the other side of the door.

She was in a very large room, composed of a central nave and a lower aisle separated by an arcade on each side.

The ceilings were very high, with pointed arches of grey stone. The walls were mostly nothing but pillars where large stained-glass windows ...