Joint enterprise law lets British prosecutors convict everyone present at a crime scene with life sentences, even people who did nothing more than stand nearby. The film follows Alex and his family through his prosecution for joint enterprise murder, using his case to test a law that dates back more than 300 years and has been leaned on heavily in recent years to prosecute gang violence, gun crime, and knife crime. Legal experts explain how the law works and where its language gets vague, particularly around how much involvement actually counts. Family members describe losing relatives to violence and, separately, watching relatives convicted for simply being at the scene. People convicted under the law speak directly about their sentences and what they say the evidence against them actually showed. The film raises the question of racial bias in how joint enterprise gets applied, without settling it, and leaves Alex's case as the throughline connecting the legal argument to what it costs one family in real time.