When Dr Johnson made his famous eighteenth-century remark about second marriages being a triumph of hope over experience, his wit could easily have been directed toward the unions that Steven King has illuminated. It is never entirely clear why people marry or choose to marry the people they do, a situation that is as frustrating to historians as to friends and family. Marriage remains one of life's great mysteries, perhaps the last great mystery left to us. It fascinates and absorbs us, providing an inexhaustible audience for daytime soap operas and evening situation comedies. Romance novels top the fiction charts; and Hollywood returns to the theme time and again.

Marriage fascinates precisely because it is so unpredictable, so much beyond our control. One would think that the riskiness of the lottery of love would frighten, even repel, us, but instead we are drawn to it as a gambler is drawn to the slots or the track. Love is, like gambling, a form of “deep play”, which reveals things about ourselves that we can only discover when we move from the world of choice to the realm of chance. Today, marriage is often the central episode in the stories we tell when we try to explain ourselves to ourselves and to others. It is the most elaborately celebrated and ritualized of all the events of the adult life course, the source of our most precious images and memories. Marriage is simply enchanting.