Read "The Dark Door" by Alan Edward Nourse online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
George Webber sat in the little room, trembling, listening, his eyes wide in the thick, misty darkness. He knew it would be a matter of time now. He couldn't run much farther. He hadn't seen them, true. Oh, they had been very clever, but they thought they were dealing with a fool, and they weren't. He _knew_ they'd been following him; he'd known it for a long time now.
It was just as he had been telling the man downstairs the night before: they were everywhere -- your neighbor upstairs, the butcher on the corner, your own son or daughter, maybe even the man you were talking to -- _everywhere_!