We are raiding the Audio Long Reads archives to bring you some classic pieces from years past, with new introductions from the authors. This week, from 2015: Amid the mayhem that has turned parts of Karachi into no-go zones, reporters risk their lives to make sense of a crime wave that is virtually an insurgency. Help support our independent journalism at <a href="https://www.theguardian.com/longreadpod">theguardian.com/longreadpod</a>