Keith Laumer, It Could Be Anything
“ With a hollow sound the door fell inward, taking with it the jamb. Brett stood staring at the gaping opening. A fragment of masonry dropped with a dry clink. Brett stepped through the breach in the grey facade. The black pool at the bottom of the pit winked a flicker of light back at him in the deep gloom. Around him, the high walls of the block of buildings loomed in silhouette; the squares of the windows were ranks of luminous blue against the dark. Dust motes danced in shafts of sunlight. Far above, the roof was dimly visible, a spidery tangle of trusswork. ”
