Line Of Duty: The SIX mysteries that were finally explained in underwhelming series finale

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The sixth series of Line Of Duty came to its long-awaited conclusion on Sunday night, with viewers finally learning the identity of the Fourth Man H.

However, despite fears this could be the show’s last hurrah, millions of viewers were still left with unanswered questions, as the future of AC-12 was left hanging in the balance, and Superintendent Hastings feared for his future after confessing he revealed John Corbett was an Undercover Officer.

So, as fans wait to see whether Jed Mercurio’s police drama could return for a seventh out, MailOnline examines some of the answers fans got to their burning questions, the mysteries that remain unsolved…

The mysteries that have finally been solved…  

Who is H? 

It’s been a question posed by die-hard and casual fans alike, after years wondering about the identity of the fourth man known as H.

On Sunday fans finally learned that Superintendent Buckells was the famous fourth man, having liased with OCG’s to bring down officers who failed to do their bidding.

Despite painting himself as a bumbling fool, the copper actually formed a secret operation with an array of ‘bent coppers’ and even blackmailed Acting Superintendent Davidson thanks to her history with the group as Tommy Hunter’s daughter.

It appeared that AC-12 had caught him red-handed, especially as Steve dealt the fatal blow by revealing he had to co-operate to make him eligible for witness protection. 

Hastings delivered the final line, declaring: ‘No one makes mugs of AC-12,’ before leaving the interview, with viewers later learning that Buckells would have to receive immunity, or none of the corruption evidence will be heard in court. 

Who was the man Jo Davidson believed was her father?

In a shocking bombshell last week Acting Superintendent Davidson learned that she was both the daughter and niece of OCG member Tommy Hunter, having previously been led to believe her father was little more than a bent copper.

But, after Davidson is rescued by AC-12 from a group of OCG members who attempt to kill her, she finally admits the man she thought was her dad was former CS Patrick Fairbank, a retired officer thrown behind bars when it was revealed he both covered up and participated in abuse at a children’s home. 

Once again, Fairbanks claims he cannot remember Davidson or her mother, insisting he doesn’t recall much of his own criminal past.

Luckily, it seems Davidson finally gets her happy ending after years under the control of the OCG, finding a new life in the countryside in Witness Protection. 

Who killed Gail Vella?

This mystery proved to be the crutch of the whole series, as fans waited to see whether they would finally learn who killed Gail Vella.

At last fans discovered that it was Carl Banks who had shot her after weapons discovered in a strong box hidden at the OCG’s workshop, meaning suspect Terry Boyle could be released.

Luckily it appeared that Vella’s death wasn’t completely in vain, as the episode’s end also revealed that Darren Hunter was now under investiation for Lawrence Christopher’s murder, though an official inquiry was yet to be opened.

Was Steve sacked for failing his drugs test?

For several weeks viewers saw Steve attempting to ignore multiple emails from Occupational Health after submitting to a mandatory drugs test.

Arnott had been struggled with a painkiller addiction to control his searing back pain from an injury suffered back in series four when he was attacked by one of the ‘Balaclava Men.’

The series six finale saw him finally sit down with the Health team who noted that while none of the drugs he’d taken were illegal, the high levels were concerning, and stated he may need a take a break from active duty.

To no surprise Steve refused, and insisted he must continue with his investigation, though he did agree to the possibility of surrendering his firearm.

Arnott then revealed his addiction to Hastings, who later implied he’d kept quiet about Steve to keep him on active duty adding he was grateful he was ‘getting some help.’

By the series’ end, Steve hinted he may take a break from work to finally ditch the pills, but still appeared to be a fundamental part of the AC-12 team.

What happened to the £50,000 Ted gave to Steph?

After being given an envelope full of £100,000 in cash, fans had been wondering what happened to half of the money, when Steve discovered £50k in John Corbett’s widow Steph’s flat.

Probed by both Steve and Kate, who feared that the gaffer could be bent, Hastings insisted he only came clean about Corbett’s undercover status in the hope he’d get back in contact.

He then revealed he gave Steph half the money in the hope it would clear his conscience, adding: ‘If there is one thing I could take back, it would be that. What a terrible thing I did.’

 

And the questions that have been left unanswered…. 

Why did Davidson point the finger at Fairbank?

Ahead of learning that Tommy Hunter was both her uncle and father, Davidson first appeared to pin the blame on Fairbank by simply confirming that her adopted dad was a ‘bent copper.’

Arnott and Bishop then decided to speak to him upon learning he was part of the same team involved in Lawrence Christopher’s murder, but failed to get any answers due to his deteriorating mental state.

By the series’ end, viewers were still unsure why Davidson tried to pin the blame on her supposed father given she herself was being blackmailed, and how this all led to her a target for the OCG after being thrown behind bars. 

Who is the REAL leader of the OCG? 

Despite the episode revealing that that Detective Superintendent Ian Buckells was actually the so-called ‘Fourth Man,’ some viewers were quick to note that he didn’t wholly confirm whether he was the leader of the Organised Crime Group.

Instead, he pinned the blame on Tommy Hunter, who was killed back in series two, meaning Buckells’ claims seemed less and less likely.

So the question still remains of whether another corrupt officer or criminal is still pulling the strings in the OCG, and Buckells’ role as a middle-man means they could still be out to cause trouble for AC-12.

What will happen to AC-12?

Despite finally uncovering the identity of H through a long paper trail of corrupt officers, fans were surprised to learn the organisation’s powers had been significantly weakened.

Fleming hinted she’d be open to taking her job back alongside Arnott and Hastings, who vowed to appeal his forced retirement despite confessing to DCS Patricia Carmichael he’s revealed John Corbett’s identity as an Undercover Officer.

Steve hinted he may take a break from active duty to overcome his addiction to painkillers, despite he and Kate appearing closer than ever as she told Occupational Health that he was ‘the best.’

Despite a final shot of the AC-12 elevator showed the trio reunited as they travelled down the lift together, viewers are less hopeful on whether they’ll get to see them together again, especially as bosses have been tight-lipped on whether the show could return for a seventh series

Will Steve get together with Steph, or Kate?

Throughout the series viewers saw Steve form a close bond with John Corbett’s widow Steph, even spending the night in her bed after continuing to struggle with back pain and his painkiller addiction.

But by the end of series six, he was clearly doubting whether to pursue a relationship with her, given how she lied about a vast sum of cash given to her by Hastings.

As series six concluded, it was clear that Steve and Kate had never been closer, as she described him as being ‘the best’ during a meeting with Occupational Health, and hinted she could be ready to return to AC-12.

Fans have long enjoyed the pair’s close friendship but perhaps series seven could lead to something more.

Who forged Fleming’s and DS Chris Lomax’s signature? 

Early in the finale, DC Bishop revealed that the report ordering Davidson’s transfer from her prison cell to Hillside Lane police station has been forged by an OCG, with a mystery member faking the signatures of both Kate and Lomax to gain access to her cell. 

Given Buckells was still in prison at the time, it was unclear who was behind the plot to have Davidson killed, as she clearly knew too much about the OCG, and whether it could have been another officer who ordered her death.

Is Chief Constable Osborne bent?

For years CC Phillip Osborne has been a prime suspect in AC-12’s investigations of corruption, and it was revealed this series that he worked on the Lawrence Christopher murder case now-deceased Marcus Thurwell, and ‘H’ Buckells

In a televised conference, Osborne commended the work of his officers in locating Gail Vella’s murder, but once again dismissed any institutional police corruption as ‘an outrageous lie.’

Given he is clearly willing to dispel any credible leads AC-12 may have, it’s possible could be involved in an OCG, and may carry on doing their dirty work for years to come.  

Will DCI Patricia Carmichael expose Hastings’ wrongdoing?

She’s become one of the show’s most maligned characters, but viewers were left hoping that Carmichael had some glimmer of compassion after Hastings decided to make a confession.

Clearly still a lawful man despite years working in corruption, Ted admitted that he did reveal to Lee Banks that John Corbett was working undercover in organised crime, indirectly leading to his death.

Carmichael simply asked: ‘What do you want me to do with that information?’ leading to one of Hastings’ best speeches yet, declaring: ‘Whatever you do, you do it because you carry the fire…’

As Hastings made his exit, Carmichael’s stoic expression hinted she is less keen to report him then viewers may think…

Will there be a series seven? 

It’s the question on every Line Of Duty fan’s lips following the finale, with the concluding episode ending on a somewhat cliffhanger.

BBC bosses are yet to confirm whether the show will be back for another outing, and even the show’s star Martin Compston stating this conclusion will be a ‘perfect ending.’

Fans will have to wait and see whether Line Of Duty will be back for another run, but it seems unlikely BBC will let the show go given its record-breaking viewership.

Line Of Duty: AC-12 FINALLY learn the identity of the elusive criminal H in shock series six finale – but fans are left ‘underwhelmed’ and convinced there has to be ‘one more twist’ 

By Laura Fox and Bhvishya for MailOnline 

Line of Duty fans across the nation were left underwhelmed as the nail-biting series finale drew to a close tonight and the mysterious antagonist ‘H’ was finally unmasked. 

Seasoned fans took to social media in their droves to share their frustrations as officers of the police anti-corruption unit AC-12 discovered that the identity of the elusive ‘fourth man’, who had been colluding with the organised crime group (OCG), was none other than DSU Ian Buckells.

The series also saw DI Steve Arnott, played by actor Martin Compston, finally called in for a meeting with Occupational Health, who noted that while he had not broken the law through his excessive painkiller use, he would have to surrender his firearms licence.

However, the episode’s end failed to offer any resolution on whether the fan-favourite team of DI Steve Arnott, DI Kate Fleming and Superintendent Ted Hastings would return, ending on the revelation that the team has ‘never been weaker.’ 

Sharing their disappointment on the ending, one disgruntled Line of Duty fan wrote on Twitter: ‘Can’t believe I watched six seasons of line of Duty for Ian Buckells, the most pointless character to be the fourth man. Fuming.’

While another wrote: ‘We waited 10 years for Ian Buckells to be revealed as the OCG mastermind.’

Another commented: ‘Everyone in the UK when we waited all this time for Ian Buckells to be revealed as the OCG mastermind.

Meanwhile another fan said: ‘I would have accepted Hastings as H over Ian bloody Buckells #LineOfDuty #LineofDutyFinale.’

During the episode, fans watched in anticipation as DI Arnott was left torn on whether to pursue fears that Hastings could be H as the team raced to uncover the mystery figure’s identity.

The officer also admitted to his friend detective Kate Fleming that he had been involved with John Corbett’s widow Steph. 

After AC-12 discovered the OCG’s workshop, they found a strong box hidden under the floor, which is revealed to contain an array of weapons used in murders investigated by Hastings and his team, including the gun that shot and killed Gail Vella, and the knife that slit the throat of DS John Corbett, who was killed by the OCG in series five. 

It’s the breakthrough that the team have been waiting for, as the box finally proves that Carl Banks was responsible for Vella’s murder before being killed by the OCG himself. 

After weeks of incessant emails, Steve is finally called in for a meeting with Occupational Health, who note that while he hasn’t broken the law through his excessive painkiller use, he should take time off from his duties.

To no surprise, Arnott refuses, but does agree to hand over his fire-arm, and comes to clean to Hastings about his drug use. To his, and the viewers’ surprise, Hastings doesn’t dismiss him, simply saying: ‘I’m glad you’re getting some help.’

Despite fans’ theories that Thurwell had to be alive, it is revealed that he was killed in the previous episode, and had actually been dead for several weeks when his body was found after being strangled.

DC Chloe Bishop, also reveals that any communication involving Thurwell and the OCG had been re-routed through Spain from a device in the UK, meaning the fourth man was definitely still amongst the corruption team.

After being imprisoned for her own corrupt behaviour, Davidson is taken away in a police van under the ruse she’s being interviewed at Hillside Lane, but in reality it’s the same criminal who strangled Lakewell several weeks earlier.

It’s clear that H is involved in the attempt to kill Davidson, as the order for her transfer boests the same ‘definately’ misspelling, as well as the forced signatures of Fleming and DS Chris Lomax.

Luckily AC-12 reach the van in time to rescue Davidson, and vow to get her into witness protection if she comes clean on H’s identity.

Jo is clearly reluctant to give up the man in charge of the Order who kept her hostage for so many years, and so AC-12 opt to return their investigation to former Chief Superintendent Patrick Fairbank but find nothing in his cell.

Despite AC-12 revealing Davidson was led to believe he was her father, Fairbank claims he ‘doesn’t remember’ anything related to her or the OCG, with a clearly-frustrated Hastings storming out of the interview.

Proving to be the clue that will crack open this decade-long mystery, Bishop spots the same ‘definately’ spelling inside a written note found in the records related to Lawrence Christopher’s murder.

The case was being investigated by Vella before she was murdered, having learned that the botched work corrupt police officers meant no one was ever charged with the racially-charged crime. 

As AC-12 debate whether to go public with the information, Hastings finally confesses to Kate and Steve about the mystery bag of money he gave to John Corbett’s widow Steph, admitting he gave her the cash as a kind-hearted gesture.

He also fiercely denied revealing Corbett’s identity as an Undercover Officer to the OCG, which eventually lead to his death. 

Regardless, the written note finally sets the stage for the most important police interview in the show’s history, with the stage set at last for Hastings to confront the criminal H who has caused so much havoc in AC-12. 

The so-called Fourth Man is then revealed to be Buckells, despite perceptions hinting he was easily-manipulated and thus the perfect target for Davidson as she did the OCG’s dirty work.

It seemed the copper was far smarter than first thought, as he’d been exchanging messages with Davidson about his criminal behaviour.

Despite his bumbling exterior, it all seemed to be a ruse, as he declared: ‘I’m only the one whose made total mugs out of you lot!’ by revealing they’d have to offer him immunity or Witness Protection if they wanted him to co-operate.

Pointing out that H doesn’t officially exist as the investigation into corruption had been quashed, he insisted Tommy Hunter was still the leader of the OCG and since his death the system had simply scattered.

Despite this, it’s clear Fleming and Arnott want to keep looking into the investigation, and open an enquiry to finally get a conviction for Christopher’s murder, but Carmichael is less convinced. 

To make matters worse, Chief Constable Phillip Osbourne makes a statement applauding the police force for finally uncovering Gail Vella’s killer, but once again denies any possibility of police corruption.

The episode concludes on an uncertain note, with Hastings coming clean about revealing Corbetts status as an UCO after vowing to appeal his forced retirement, before leaving with the AC-12 team, and on-screen text noting that their powers to curb wrongdoing in the force have never been weaker.

Davidson enters Witness Protection, while it appears that if Buckells gains immunity, none of the evidence for corruption will be heard in court, meaning the entire investigation will have been for nothing.

Mere hours before the episode was due to air, both stars Vicky and Martin paid tribute to the show’s fans and their co-stars on social media, though neither post appeared to dispel fans’ concerns that series six could be the last. 

Given the show’s record-breaking viewership, fans hoped that the finale would answer all their burning questions, including whether DCI Thurwell could still be alive after his body was supposedly found in last week’s episode and whether DCS Carmichael is the elusive fourth man.

Another mystery that has stemmed from series six was the £50,000 that Steve discovered in John Corbett’s wife Steph’s house, after being given the vast amount by Hastings himself.

Confronting Steph about her husband’s ‘life insurance,’ she insisted the money had been invested in a hairdressers, leaving many fans wondering whether she could be involved in an OCG after her husband worked undercover for a crime group in series five. 

Having seen its ratings increase throughou its eight-year run, series six kicked off with a record-breaking 15 million viewers tune in for its opening episode in March, and since averaged between 12 and 13 million viewers.

The preview episode of the finale was shrouded in secrecy by the BBC, with TV insiders and journalists given a plethora of passwords to access the show. 

A source said: ‘Staff were under strict instructions to keep character and plot revelations under strict lock and key.

‘Friends and families of the key actors also kept schtum on letting slip on any show details.’

Ahead of the sixth series finale, feared by many to be the show’s last hurrah, fans got a glimpse of the episode through an action-packed trailer, complete with a police standoff, the return of balaclava men and the discovery of a written note with THAT ‘definately’ misspelling. 

However, despite the huge success of the BBC show, Martin Compston revealed the BBC drama could be coming to an end sooner than everyone thinks.  

Martin – who previously revealed that executive decisions about the series are ‘above his pay grade’ – cast doubt on the show’s future during an appearance on The Jonathan Ross Show. 

Speaking on Saturday’s show, Martin, 36, said: ‘We won’t come back just for the sake of it. That’s for sure. We’ll come back if there’s a story to tell. 

‘If it ends well maybe sometimes it is best to leave it. But genuinely we don’t know.’

The admission comes after Martin teased that fans will get some ‘big answers’ during the finale, and admitted he believes it could be the ‘perfect ending’ to the police drama.

Speaking on the Shrine Of Duty podcast, Martin confessed that he thinks Sunday’s episode could be the best way to wrap up the ‘story arch’ – but he refused to rule out another series.

When quizzed on whether viewers will learn who the illusive ‘H’ is, Martin said: ‘I wouldn’t quite go the Jo Davidson no comment route – but what I will tell you is I think there’s a lot of pay offs coming this Sunday.

‘There’s a lot of big answers and it’s deserved, people have stuck with us for a long time, so there comes a point where the story arch comes to an end.’ 

Like many shows, series six was hit by several delays due to the Covid pandemic, with filming in Belfast halted back in March 2020, just days before the UK was plunged into lockdown.

Production was finally able to resume in September that year with strict safety guidelines, including the use of studio sets as opposed to real locations, regular testing measures.

Filming for series six finally wrapped in November, with bosses later confirming it would be seven episodes as opposed to the usual six.