In Holt, Colorado, widower Louis Waters is initially thrown when the widowed Addie Moore suggests that they spend time together, in bed, to stave off loneliness. "No, not sex," she clarifies. "I'm talking about getting through the night. And lying warm in bed, companionably." Her husband died years ago, as did his wife, and in such a small town they naturally have known of each other for decades; in fact, Addie was quite fond of Louis's wife. His...