The Fixer (2008)

The Fixer is a British drama television series, produced by Kudos for ITV. Set in modern Britain, it follows the life of John Mercer, an ex-British Special Forces soldier, arrested by police for killing his aunt and uncle following his discovery of their abuse of his sister, Jess Mercer. John Mercer is released early from prison to serve in a covert state security squad as a government-backed assassin responsible for eliminating criminals and renegade police officers that the law cannot apprehend.