Mo Hayder said this quote

I had an overwhelming sense of the lonliness of this city - a trillion souls in their bedrooms, high in the cliffs of windows. I thought of what was underneath it all - I thought of the electricty cables, steam, water, fire, subway trains and lava in the city's guts, the subterranean rumbling of trains and earthquakes. I thought of the dead souls from the war, concreted over.