This documentary looks at the dire and tragic consequences of one punch kills. It examines three different cases of such incidents, which all occurred in innocuous locations and circumstances. One was a row that broke out over a parking space in a supermarket car-park, another an unexpected fight outside a nightclub, and the third happened at a teenage house party. The film depicts what happens when perpetrators become accidental killers. It includes a behind bars interview with a convicted attacker as well as CCTV and mobile phone footage depicting what led to the fatal assault.