On the afternoon of 10 April 2007 I was on a plane over the Atlantic watchingInfamous, one of the films about Truman Capote. It contains a scene where Truman and his frightful swans are discussing the Clutter family murder case. ‘Weren’t you scared going into their cells?’ asks Babe Paley (played by Sigourney Weaver), speaking of the murderers while sipping a martini and purring for the Upper West Side.

‘Well,’ he says, ‘it’s not as frightening as meeting Norman Mailer.’