When Paula Poulton is found murdered in the boot of her car, the investigation quickly turns to her secret lover, Roger Kearney. Despite a lack of forensic evidence, Kearney is convicted of the crime based on circumstantial evidence, including CCTV footage that the prosecution claims shows his car near the scene. Years later, the charity Inside Justice takes up his case, meticulously re-examining the evidence to determine if a miscarriage of justice occurred.