In Ali Smith’s eccentric, adventurous and intoxicating fiction, the everyday is rarely ordinary. Her new novel begins with a simple premise: in the middle of a dinner party, one of the guests, a man called Miles, goes upstairs to his hosts’ spare bedroom. He locks the door and refuses to come out. ‘Fine for water but will need food soon,’ says the note he pushes under the door. ‘Vegetarian, as you know. Thank you for your patience.’ Months pass, journalists arrive, crowds assemble, and the man in the room, who persistently refuses laptops, mobile phones and the chance to explain himself, becomes a popular cause célèbre.