Ryan Marks is a former Special Forces soldier drawn back into the criminal underworld of his native London. While serving abroad, where he rescues a fellow soldier named Deacon from a hostile compound, Ryan learns that his father has died of a heart attack. He returns home for the funeral, met at the airport by his brother Nick and reunited with his mother Anne and sister Michelle. The family's grief is cut short when Tony Sharp, a ruthless London crime boss, storms the gathering with his brother Keach and an enigmatic associate named Kayla, turning a mourning household into a hostage standoff. Sharp intends to seize the Marks family's turf now that its patriarch is gone. Forced to flee to a hidden safe house, Ryan resolves to protect his mother, brother, and sister at any cost, setting out to confront Sharp and dismantle his empire before it can destroy everyone he loves.