COMPARED TO THE OTHER FLOORS this floor shone with light and I couldn't see any wood panelling, instead marbled dove grey stone walls and floors that reflected the light from ornate iron and glass lamps hanging from the ceiling. It felt like stepping into an art gallery, so pristine and modern; but the coppery scent of blood stopped me. I paused in the narrow corridor, ears straining to make out the strange grating sound I could hear. It seemed vaguely familiar, yet set my teeth on edge.