Based on

TV Shows like Harry's Game (1982)

British undercover agent Harry Brown is sent to Northern Ireland to infiltrate the IRA to find (and terminate) the assassin of a British Cabinet Minister. Harry is alone, the army hasn't been told he is being put in place, his wife is fed up with him and his job, and his sole new friend, an Irish woman who falls for him, will be consumed by his relentless search for the assassin.