Until gang warfare and the bombings that went with it broke Sweden’s calm (the consequences of recent mass immigration have proved rougher-edged than many Swedes chose to expect), the Nordic region had for a long time been renowned for its tranquility, making it somewhat surprising that it gave birth to Nordic noir, a genre of thriller often as chilly as the realm from which it emerged. Each Nordic country has its leaders in this field, and in Norway the top dog is Jo Nesbø, hip, stylish, something of a polymath (soccer player, stockbroker, musician), and the best-selling Norwegian author of all time, renowned above all for a series of often brutal stories (recommended) featuring Harry Hole, a brilliant, awkward Oslo detective with a fondness for the bottle…