A marriage is a private business, even for people who leave behind them such a vast litter of diaries, letters and third-party gossip. What occurs at its centre, what bonds maintain it, are not always visible, or even guessable, to the outsider's greedy eye. The sense that arises from this residue of words is of an abiding love, comprised in equal parts of affection and intellectual stimulation. My inviolable centre, Virginia called Leonard...