The past, Julian Barnes once wrote, has a way of behaving like a piglet, greased up and let loose in a room. It makes a lot of noise. People make fools of themselves trying to capture it. Invariably, it slips away.
This is the very business of biography — “the most sheepish and constrained of the arts,” the English journalist and satirist Craig Brown writes in his new book, Ninety-Nine Glimpses of Princess Margaret. However, his study of the princess, the younger sister of Queen Elizabeth — and one of the 20th century’s great malcontents — is gloriously truant. Brown ignores

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