I first met Joan Didion in the summer of 1993, soon after I moved to New York, at the launch party for Christopher Hitchens’s book For the Sake of Argument. I was mesmerised by the hand with which she held her glass – her long, thin fingers. Those hands are on show in the recent Netflix documentary about Didion made by her nephew, Griffin Dunne: she waves her arms and hands in front of the camera as if casting a spell. I’d recently been to Miami and had read her book about the city. As she saw it, Miami was ‘long on rumour, short on memory, overbuilt on the chimera of runaway money and referring not to New York or Boston or Los Angeles or Atlanta but to Caracas and Mexico, to Havana and to Bogotá and to Paris and Madrid’. Much of Miami is about the Cuban exile scene, where a love of guns, violence and conspiracy prefigures the paramilitary supporters of Donald Trump. ‘As in other parts of the world where citizens shop for guerrilla discounts and bargains in automatic weapons, there was in Miami an advanced interest in personal security.’ A single word, ‘advanced’, turns a flat sentence into something else.