A murder is investigated by both sides of the line, cops and criminals, using opposing methods. But the real line is the morality within each person and how far they will go before they cross it.
- Year: 2011
- Country: United Kingdom
- Genre: Crime, Drama, Mystery
- Studio: BBC Two
- Keyword: police, england, gangster, espionage, detective, organized crime, conspiracy, miniseries, drug lord, british noir, murder investigation, murder mystery, political conspiracy
- Director: Hugo Blick
- Cast: Chiwetel Ejiofor, Christopher Eccleston, Kierston Wareing, Stephen Rea, Rafe Spall, Eve Best