B ritain, muses trainee barrister Xan, was getting “hotter, crueller and angrier”. Amanda Craig’s 10th novel watches as it boils over. Her setting is Prospect Park, a fictional north London suburb caught between gentrification and decline, on the 12th day of Christmas. Outside a hotel housing asylum seekers, protesters and counter-protesters have gathered. In a flat nearby, a man has been stabbed, and thugs go from shop to shop, searching for the teenage boy they think did it. Locals look on anxiously. Jade from the beauty parlour and Daisy from the health food shop brave the central street to warn others of trouble. In the kebab shop, Mehmet locks up his doner meat and sharpens his knives. Places with shutters close them. In a book-lined cafe, the regulars – a motley crew of writers who visit to nurse hot drinks and shuffle their novels towards closure – are joined by workers from next door’s bakery.…