He did, and he didn’t. That is Laura Thompson’s artful conclusion to the enduring question of whether John Bingham, the seventh Earl of Lucan, killed his children’s nanny in his family house in Belgravia forty years ago. She is smart enough to realise the difficulties in arriving at a definitive verdict on the events of that fateful night in November 1974, which policemen, investigators and journalists have pored over for so long. 

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