Kent Haruf’s final posthumous book, “Our Souls at Night” is one that resonates long after the last chapter. The slim book is a moving meditation on old age, life’s expectations and disappointments, and the little things that matter. Two neighbors come to share company with each other in an unexpected way—even to each other. They discover it’s never too late to love. The author’s spare, plain-spoken dialogue is both humorous at times and often poignant as his characters relate their lives and hard-earned wisdom. Haruf also manages to weave his other Holt, Colorado books into the story in a clever way in this understated and satisfying denouement to his writing career.