The Brazilian documentarist Padilha's 2007 thriller Elite Squad painted a grim portrait of Rio's incorruptible elite squad Bope (Special Police Operations Battalion) going about its lethal work in the favelas in preparation for a Papal visit. This sequel demonstrates how over the next five years Bope's two principal leaders were co-opted into the state government by crooked politicians in order that, district by district, corrupt local militia leaders could oust the mafia and control the criminal underworld. It's a complicated story told in a single extended flashback with brilliantly staged set pieces and offering an appalling picture of the city that is to host the 2014 Fifa World Cup and the 2016 Olympic Games.