In Birmingham, two postcodes a mile apart have spent three decades at war: B21, home to the Burger Bar Boys, and B6, home to the Johnson Crew. This film follows two men, one from each gang, from Handsworth and Aston, as they try to broker peace between them. Shot before, during, and after the 2011 riots that swept the city, it catches the effort in real time, including the setbacks that come with recruiting former enemies to a truce nobody trusts yet. The project grows out of Penny Woolcock's earlier hip-hop musical 1 Day, which drew on the same rivalry, and that connection gives the peacemakers an opening into communities usually closed to outsiders. Their search for a workable process leads them to Jonathan Powell, who negotiated the Good Friday Agreement in Northern Ireland, and his advice becomes a rough template for what they attempt at home. The film stays with the two years of talks, doubts, and small gains, without pretending the violence stops on cue.