In the title story, a man abandons his indifferent wife and wanders into a small-town movie theater where he finds himself just as invisible as he was at home. In the masterfully comic “Saturday Teatime,” a woman trying to relax in a flotation tank is hijacked by memories of her past. In “Whole Family with Young Children Devastated,” a woman, inadvertently drawn into a stranger’s marital dysfunction, meditates on the failings of modern life as seen through late-night television and early-morning walks.