Keith Laumer 
The Walls [EPUB ebook] 

In a future of extreme overpopulation, Flora yearns to escape the tiny, windowless apartment she shares with her husband Harry. When Harry installs virtual reality walls to distract her from the claustrophobia, Flora embraces the illusory landscapes—until Harry adds more screens that leave her feeling more trapped than ever. On the brink of a nervous breakdown as the walls close in, Flora makes a desperate plea for help from her increasingly indifferent husband in this chilling vision of technology gone too far.