Line of duty

A Brief Blurb
The Line of Duty is a BBC police drama for all the series except series one it was all filmed in Northern Ireland locations. BBC described it as *Bent coppers and the detectives sent to stop them. AC-12 isn't here to make friends. Will their investigations land them deadly enemies?* *BBC* The show is all about the AC-12 unit AKA the Anti-Corruption unit trying to track down *Bent Coppers* At the start we follow DS Steve Arnott (Martin Compston), a firearms officer who was transferred to Anti-Corruption Unit 12 (AC-12) after refusing to agree to cover up an unlawful shooting by his own team.

When he arrives at AC-12 he gets a new partner called DC Kate Fleming (Vicky McClure) who is an undercover officer. Throughout the show they work together alongside there superintendent Ted Hastings (Adrain Dunbar) * Throughout the series, AC-12 investigate seemingly disparate cases involving seemingly-corrupt police officers such as DCI Tony Gates (Lennie James), DI Lindsay Denton (Keeley Hawes), Sergeant Danny Waldron (Daniel Mays), DCI Roseanne Huntley (Thandie Newton), and undercover officer DS John Corbett (Stephen Graham). AC-12 realise the pervasive nature of corruption and the police's deep-rooted links to an organised crime group.*

Main Characters

 * Martin Compston as Detective Sergeant Steve Arnott, assigned to AC-12, the anti-corruption unit within the Central Constabulary. Previously, he served as a counter-terrorism officer. He transferred after he refused to collude with his colleagues following the fatal shooting of an innocent man.
 * Vicky McClure as Detective Inspector Kate Fleming, an undercover specialist and consummate professional, Fleming is willing to investigate officers inside and outside AC-12. Initially a detective constable, she is promoted to detective sergeant at the end of the third series and to detective inspector following the fourth. She is married, though separated, with a son.
 * Adrian Dunbar as Superintendent Ted Hastings, the senior investigating officer of AC-12. He recruited Arnott, Fleming and Cottan. Once a member of the Royal Ulster Constabulary, he is a Roman Catholic and a Freemason.
 * Craig Parkinson as Detective Inspector Matthew "Dot" Cottan (series 1–3), an AC-12 officer, was initially introduced as a DS on Tony Gates's TO-20 team. At the beginning of series two, he is promoted to DI and transferred to AC-9. He is seconded to AC-12 by Hastings. Cottan is "The Caddy", working as a fixer for an organised crime group. At the close of the third series, he is killed after escaping from AC-12 custody.
 * Lennie James as Detective Chief Inspector Anthony "Tony" Gates (series 1), the head of the serious crime unit TO-20, Gates is renowned for returning the best crime figures of any unit in the Central Constabulary. It is this reputation, however, that leads AC-12 to his team. Suspected of corruption, Gates faces an internal affairs investigation that adds further complications to his troubled home life.
 * Keeley Hawes as Detective Inspector Lindsay Denton (series 2–3), a silver commander who organises a convoy to transport a protected witness that is ambushed, resulting in the deaths of all the other police officers. As the only police survivor, Denton is charged with conspiracy to commit murder. She attempts to convince AC-12 of her innocence and regain her reputation, but eventually receives a life sentence. In series 3, Denton is granted an appeal and is acquitted because of an alleged sexual relationship with Arnott while she was being investigated. She discovers crucial evidence pertaining to the Danny Waldron murder investigation and historical child sex abuse, but after refusing to accept a bribe to conceal that evidence, she is murdered by Cottan.
 * Daniel Mays as Sergeant Danny Waldron (series 3) is an Authorised Firearms Officer (AFO). His armed response unit is investigated by AC-12, as a matter of routine following the shooting of a suspect. A deeper investigation is initiated when Arnott and Fleming discover the shooting may have been unlawful. Waldron is shot and killed by a colleague; his death results in an investigation into historic child sex abuse.
 * Thandie Newton as Detective Chief Inspector Roseanne "Roz" Huntley (series 4), the senior investigating officer of Operation Trapdoor, at the centre of an AC-12 investigation for mishandling evidence.
 * Stephen Graham as Detective Sergeant John Corbett (series 5), Corbett is an undercover police officer using the name John Clayton, who has been uncontactable for several months. He then appears as the gangleader of an organised crime group that hijacked a police convoy transporting seized drugs.
 * Anna Maxwell Martin as Detective Chief Superintendent Patricia Carmichael (series 5), the senior investigating officer of AC-3, who is drafted in to review AC-12's handling of the Corbett investigation.
 * Kelly Macdonald as Detective Chief Inspector Joanne Davidson (series 6), the SIO of "Operation Lighthouse"; the investigation into the murder of a journalist, Gail Vella. Her unconventional conduct raises suspicions at AC-12.