Going to prison for a crime you did not commit has to be one of the most horrific things that could happen to a person, but sadly, as we know, the justice system doesn't always work and people do. This documentary meets four people who were exonerated after serving lengthy prison sentences for crimes they did not commit, looking at the mental and physical fallout from their long-term incarceration and how they feel now about the injustice that was done to them. We meet Paddy Hill - one of the Birmingham Six - a man who served 25 years after being convicted of murder at the age of 19, Peter Pringle - the last man sentenced to death in Ireland in 1980, Sunny Jacobs - who served 17 years on death row in the USA and is married to Peter Pringle, and Robert Brown - who served 25 years in the UK.