From the author of the international bestsellers Essays in Love, The Architecture of Happiness, and How Proust Can Change Your Life, comes a novel that explores with trademark warmth and wit the complex landscape of a modern relationship.      Rabih and Kirsten meet, fall in love, get married. Society tells us this is the end of the story. In fact, it is only the beginning.     Over the years this ordinary couple will miscommunicate and misunderstand each other, will worry ab