Martin Compston as DS Steve Arnott

Episodes 23

Episode 1

1x1
June 26, 2012
6.0

Steve Arnott realises the target in his anti-corruption case is the city's top detective.

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Episode 2

1x2
July 3, 2012
8.0

Having been duped into covering up Jackie's crime, Gates tries to sever ties with her.

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Episode 3

1x3
July 10, 2012
8.0

Arnott is convinced Gates played a part in Jackie's disappearance.

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Episode 4

1x4
July 17, 2012
0.0

Desperate for proof of Gates's corruption, Fleming pushes their relationship to the limit.

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Episode 5

1x5
July 24, 2012
7.0

With Gates on the run, the anti-corruption team come under pressure to close the case.

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Episode 1

2x1
February 12, 2014
0.0

A brutal ambush on a police convoy leaves three officers dead.

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Episode 2

2x2
February 19, 2014
0.0

AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit.

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Episode 3

2x3
February 26, 2014
9.0

Lindsay is denied bail and finds herself targeted in prison.

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Episode 4

2x4
March 5, 2014
9.0

Lindsay is granted special dispensation to visit her dying mother.

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Episode 5

2x5
March 12, 2014
9.0

Lindsay fights for her life against the conspiracy of corrupt police officers.

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Episode 6

2x6
March 19, 2014
9.0

AC12's investigation finally exposes a vicious criminal gang run from within the police.

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Episode 1

3x1
March 24, 2016
0.0

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

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Episode 2

3x2
March 31, 2016
0.0

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

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Episode 3

3x3
April 7, 2016
0.0

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

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Episode 4

3x4
April 14, 2016
0.0

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

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Episode 5

3x5
April 21, 2016
0.0

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

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Episode 6

3x6
April 28, 2016
0.0

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

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Episode 1

4x1
March 26, 2017
0.0

DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation. When another young woman is abducted, Roz is on the scene to track down and charge a 24-year-old man. But doubts around the young man's guilt lead the chief forensic investigator to ask AC12 to investigate. Is Roz ignoring forensic evidence that might prove the young man's innocence?

AC12's Supt Hastings, places DS Kate Fleming undercover inside Roz's team to dig deeper into the case. With DS Steve Arnott piling on pressure from the outside, Roz is forced to act decisively. A mother of two and wife to Nick, Roz will do anything to stop her life from unravelling.

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Episode 2

4x2
April 2, 2017
0.0

A dismembered body is discovered, and worries grow when DCI Roz Huntley fails to report for duty. AC-12 crank up their investigation into Operation Trapdoor, concerned that Michael Farmer will go to jail for crimes he didn't commit. With suspicions that Roz may have withheld crucial evidence, a new DCI is drafted in to run Operation Trapdoor.

Kate makes progress in her undercover role, but AC-12's investigation falters when they realise that their main informant, forensic investigator Tim Ifield, has also gone missing.

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Episode 3

4x3
April 9, 2017
0.0

As AC-12 wrestle with the new forensic evidence casting doubt over Tim Ifield, Kate is approached by another woman claiming to have been assaulted by Michael Farmer.

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Episode 4

4x4
April 16, 2017
0.0

Roz's husband Nick is brought in for questioning by AC-12. But while Nick denies any involvement in Steve's attack, his suspicions about Roz mount. Meanwhile, AC-12 discover new anomalies in the forensic evidence and issue DCI Roz Huntley with a second Reg 15 notice. AC-12's case appears watertight until Roz starts dismantling their evidence with inside information of her own.

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Episode 5

4x5
April 23, 2017
0.0

DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.

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Episode 6

4x6
April 30, 2017
0.0

While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.

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