LINE of Duty has had viewers gripped for five series and now it's back for more.
The BBC crime drama stars Vicky McClure, Martin Compston and Adrian Dunbar as the AC-12.
What happened in Line of Duty season 1?
The first series debuted in 2012 and followed DC Kate Fleming, DS Steve Arnott and Superintendent Ted Hastings as they investigated recently named Officer of The Year DCI Tony Gates (played by The Walking Dead actor Lennie James) for corruption.
An innocent man gets killed after a counter-terrorist police unit raids the wrong flat.
Steve refuses to comply in a cover-up so gets transferred to AC-12, an anti-corruption squad which is lead by Ted.
The gang are called upon to focus their attentions on Tony who they suspect has been doing "laddering" – a technique in which different charges are placed on the same defendant to increase an officer's number of successful cases.
Meanwhile Tony has offered advice to his girlfriend Jackie Laverty who claims to have hit a dog while drink driving home from a work party.
But it transpires that Jackie actually hit a person – her accountant who had unearthed that she had been laundering money for local mobster Tommy Hunter – not a dog as claimed.
Just when Tony was about to reveal what really happened, Jackie was murdered and Tommy was framed for the deed.
Tommy starts to blackmail Tony so he tries to track the mobster down, with AC-12 in hot pursuit.
Tony agrees to lead AC-12 to Tommy, allowing for his arrest before committing suicide.
But it's not all over there! Viewers learn that DS Matthew 'Dot' Cottan had been Tommy's inside man the whole time.
They gave him the codename of 'The Caddy' because he used to carry the mobsters' golf kit as a youngster.
Matthew or 'Dot' told Tommy what to say to the police, leading him into witness protection.
What happened in Line of Duty season 2?
DI Lindsay Denton – as played by Bodyguard actress Keeley Hawes – lead the drama in this season.
The character was involved in a police convoy ambush which lead to the death of some colleagues as well as a member of public who was under witness protection.
But the anti-corruption unit become suspicious of DI Denton as it transpired that she was battling a crippling debt problem, and clock that she would have realised as the sole survivor she may be entitled to a big pay-off.
Arnott and Fleming from the previous series continue their hard work and focus their attentions on the shifty DI.
Fleming takes on the case after ending her affair with one of the deceased colleague's husband's.
While Arnott also embarks in a steamy relationship with sexy new colleague Georgia – until she meets a tragic fate.
And – perhaps unsurprisingly – the series ends with Lindsay Denton being found guilty as charged.
But it does come with a twist, her motive wasn't so much financial as it was covering up a bad decision that lead to the death of four colleagues.
What happened in Line of Duty season 3?
This series officer Daniel Waldron investigated by AC-12 after a suspect was shot and killed.
But the first episode ends with the officer himself getting killed.
The unit uncovered a paedophile ring at Daniel's old school involving some high-powered figures including Jimmy Saville.
It turned out that Daniel had been taking revenge on his previous abusers at the boys' school.
But all the while, Dot was trying to stifle the case and stop it from coming out.
Series 2's Lindsay also made a return after not being found guilty for conspiracy to murder.
And The Caddy became the subject of AC-12's interest after two series of dodging justice.
Unfortunately, he met his fate in a high-speed car chase as he tried to escape police officers.
What happened in Line of Duty season 4?
The gang turn their attentions to Roz Huntley (played by Thandie Newton) in this series.
They explore a potential miscarriage of justice when the pressure to close a case resulted in the wrong man – Michael Farmer (played by Scott Reid) – getting locked up.
Is mother-of-two Roz responsible for an innocent man rotting behind bars?
It also saw the exoneration of Ted, Michael Farmer and Hana Reznikova who were unfairly implicated in the conspiracy.
Kate, Steve and Ted unmasked Assistant Chief Constable Derek Hilton for his pivotal role in the series' conspiracy.
They were convinced Hilton was the mystery 'H' who was complying with powerful criminals, but the finale ended with Hilton dying.
What happened in Line of Duty season 5?
An organised crime group (OCG) hijacks a police convoy transporting seized drugs and kills three armed officers; AC-12 suspect that undercover police may be involved.
They discover that the undercover officer is DS John Corbett and not, as originally assumed, Lisa McQueen.
AC-12 discover that Corbett has links to Northern Ireland. Arnott arranges to meet Corbett, backed up by armed officers. Corbett tells Arnott that he had attacked Hastings' wife Roisin who is now in hospital.
Hastings orders Arnott via his wire to shoot Corbett, but he refuses. Corbett reveals the location of a meeting between the OCG and "H" and then escapes.
AC-12 and the Cybercrime unit impersonate "H" and make contact with the OCG via a laptop.
The OCG transport a group of women to their base to be trafficked. Corbett wants to free the women, however, the OCG kill Corbett as they realise that he is the rat.
Meanwhile, Hastings is suspended and investigated by DCS Patricia Carmichael and her team, and they continue to interview him.
They question him about the £50,000 in banknotes they found in his hotel room.
This leads Carmichael's team to interrogate Hastings' communications data for further evidence.
The epilogue reveals that Operation Pear Tree is now officially closed. Fleming received a commendation for her investigation into Pear Tree.
Arnott was commended alongside her after an independent panel cleared him in shooting Tranter.
Unnervingly Ryan Pilkington is now a student police officer (you'll remember him as a kid from season 1).
Hastings received a final written warning but continues to lead AC-12.
Are the plots based on true stories?
Yes- Some storylines are a case of art imitating life.
Speaking about these plot inspirations, showrunner Jed Mercurio told the Express, “Well, there are actually, really relevant examples in British legal history of Stefan Kiszko and you should look up who his solicitor was.
"It’s interesting – and the other one is Barry George, who convicted and then acquitted of the Jill Dando murder. So, there are actually, really relevant correlates in the British system.”
When is Line of Duty series six on BBC One?
Good news, Line Of Duty returns THIS SUNDAY (March 21, 2021).
You can catch it on BBC One at 9pm.
After it has aired it will be available on the iPlayer.
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