The series focuses on inner city crime life in both the United Kingdom and Ireland. Ex-criminal Michael O'Connor (Dougray Scott) comes back to Ireland to live with his new pregnant partner Anna, free from his past life of crime in the UK. Michael was arrested and spent years in prison in the UK, leaving his wife Lynne and son Séan (Reece Noi) on their own. Three days later his wife Lynne was murdered, leaving Michael devastated, and he quickly turns his back on crime. He returns to Ireland, leaving his son Séan behind in the care of Lynne's sister Connie.
Connie and Séan live in a gang-ridden Manchester suburb. Séan distances himself from the gangs, and their culture of violence. But it's not long until gang leader Jacob King (Dwayne Scantlebury) disturbs the peace. However, with the unfolding of unexpected events, Séan is arrested for a murder which he did not commit, and is imprisoned. These events lead his father Michael back to Manchester to help free his son from prison. Manchester however brings back painful memories for Michael, as it was here his wife was murdered, and comes to terms that his past involvement in crime resulted in Lynne's death.