The scrawny little girl with ‘pipe-cleaner legs’ wants to feel at home with her parents. But father and mother live mostly apart —the former in Sweden, the latter in Norway or New York — and the trio fails to bond: ‘It was never us three.’

Her famous father is a migratory sage with ‘a unique talent for partings’, obsessively orderly and punctual but happy to let this youngest child (of nine, by five wives, and the girl’s unmarried mother) grow up ‘without any plan or direction’.