Line of Duty

If you think catching criminals is tough, try catching police officers.

A drama about the investigations of AC-12, a controversial police anticorruption unit.

CrimeDramaMystery

Seasons

1. Episode 1

Air Date: 2012-06-26

When Steve Arnott is transferred to a police anti-corruption unit, he finds his target is the city's top detective, Tony Gates. Can Gates really be as good as he appears? Arnott must engage in a cat-and-mouse struggle to uncover Gates' secret.

2. Episode 2

Air Date: 2012-07-03

Having been duped into covering up Jackie's crime, Gates is desperate to sever ties with her. But, as Arnott and Fleming close in on his secret, Gates is plunged into an even more dangerous situation than he first thought.

3. Episode 3

Air Date: 2012-07-10

Arnott is convinced Gates played a part in Jackie's disappearance. With Fleming's help, the anti-corruption team tries to trap Gates into revealing his involvement in covering up Jackie's crimes.

4. Episode 4

Air Date: 2012-07-17

Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit. But her behaviour causes Morton to question if she might not be such a loyal colleague after all.

5. Episode 5

Air Date: 2012-07-24

With Gates on the run, the anti-corruption team come under pressure to close the case once and for all. Arnott is forced to make some tough decisions about where his loyalties lie. Fleming and Hastings go all out to catch Gates, leading to a shattering conclusion.

1. Episode 1

Air Date: 2016-03-24

Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal.

2. Episode 2

Air Date: 2016-03-31

After the shooting at the drugs house, DC Fleming increases the pressure on Danny Waldron.

3. Episode 3

Air Date: 2016-04-07

DS Steve Arnott believes there is a dark secret in Danny Waldron's past.

4. Episode 4

Air Date: 2016-04-14

Fresh testimony launches AC-12 back on the trail of a corrupt officer.

5. Episode 5

Air Date: 2016-04-21

Loyalties are divided when DS Steve Arnott comes under scrutiny from his colleagues.

6. Episode 6

Air Date: 2016-04-28

DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence.

1. Episode 1

Air Date: 2021-03-21

DCI Jo Davidson receives new information about the whereabouts of a suspect in the unsolved murder of investigative journalist Gail Vella. En route to raid the property, she spots an armed robbery in progress and stops the convoy. Suspicious of her motives, AC-12 launch an investigation. Still dealing with the fallout from their explosive investigation into undercover officer John Corbett, AC-12 soon realise they are facing their most enigmatic adversary yet.

2. Episode 2

Air Date: 2021-03-28

Having opened an official inquiry into DCI Jo Davidson and Operation Lighthouse, AC-12 begin to suspect a cover up. Steve and Chloe dig into Gail Vella’s controversial reporting for clues to her murder, and find links to previous AC-12 cases. Their investigation takes a shocking turn when they begin to scrutinise Jo's personal life.

3. Episode 3

Air Date: 2021-04-04

On the strength of evidence from a new witness, DCI Jo Davidson brings Terry Boyle back in for questioning about Gail Vella's murder. Kate is torn between loyalty to Jo and wanting to assist AC-12's investigation, and tensions increase when Kate encounters a face from the past with links to organised crime.

4. Episode 4

Air Date: 2021-04-11

DCI Jo Davidson faces increasing pressure from all sides as AC-12 make major breakthroughs in the investigation, but an attempt to interview a key witness goes horribly wrong.

5. Episode 5

Air Date: 2021-04-18

AC-12 link Gail Vella’s murder with a historic case of police corruption, and Kate hatches a plan to tell once and for all if Jo is bent. They are closer than ever to cracking the case, but when Hastings’ authority is undermined it leaves his team in a potentially dangerous situation.

6. Episode 6

Air Date: 2021-04-25

As AC-12 struggle to deal with the repercussions of tragic events, Hastings makes one final bid to uncover institutionalised corruption before his time runs out.

7. Episode 7

Air Date: 2021-05-02

With time running out, AC-12 attempt to unmask 'H', the Fourth Man (or Woman) commanding the network of corrupt officers behind the murder of Gail Vella. But sinister and powerful forces appear intent on orchestrating a cover-up.

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