Line of Duty fans are chomping at the bit to finally discover who the mysterious H is.
Hardcore fans of the hit BBC police show have waited six series – nine years in fact – to find out who – or what – H might be.
It's yet to be revealed if he/she is the fourth and illusive member of the Organised Crime Group or part of a secret organisation embedded in the police force that the AC-12 team have yet to unravel.
Will H be unmasked or will fans be left with another cliffhanger ahead of another series?
Ahead of the last episode of the sixth series, Daily Star has taken a look at all the latest theories before the conclusion of Sunday night’s final episode.
From pen taps to spellings, as well as all the prime suspects, we focus in on all the evidence as the show approaches its nail-biting climax!
Will we find out who/what H is?
In the last series of the show, viewers were shocked to learn that there were actually four H’s.
And AC-12 have already reeled in three of the corrupt group who, secretly behind-the-scenes, had been working for the OCG.
Dot Cottan paid the ultimate price with his life for his betrayal to the force when he was shot dead in one of the earlier series, but his secret Morse code hand signals helped Kate Fleming work out there were more bent coppers to arrest.
ACC Derek Hilton and Senior Legal Counsel Gill Biggleloe have also been taken down, but H still remains.
But one fan theory that has gained popularity is that H is not a person, but in fact a place.
Some have suggested H stands for The Hill, AKA Hillside Police Force meaning the whole station is bent.
It’s been suggested after Dot Cottan's death was revisited that the OCG have complete power over one station, taking corruption to a whole new level.
Superintendent Ted Hastings
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One of the most enduring theories is that H is under-fire AC-12 boss Ted.
Ted is on his final warning due to his suspicious conduct and been told he’ll soon be retired early with AC-12 wound down.
He’s been caught with cash in his hotel room, made an unusual prison visit to see a hardened criminal and also jeopardised an undercover operation, but yet the net has been closing in on the OCG gang.
Undercover copper John Corbett accused of him being bent and then met his grizzly end soon after.
He has also spelt wrongly spelt “definitely” as “definately”, thought to be the same as H in the series whilst communicating with corrupt officers.
He also sparked suspicion as he stopped the arrest of corrupt officer Ryan Pilkington, despite it being clear that Ryan was dangerous and targeting Kate.
DI Kate Fleming
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Kate attempted to thwart the investigation into new boss Jo Davidson, leaving viewers wondering if she is secretly corrupt.
She’s seen her marriage fall apart and some fans have suggested she’s been the missing link all along having been part of a shared membership of corrupt officers.
With her husband and son not being seen all series, it could a huge hint that she is now estranged from her family after constantly abandoning them for dodgy dealings.
Wth Jo and Kate growing closer, and even actively agreeing to work together in the sixth episode as they evaded and lied to the police, it is becoming more likely that Kate is hiding something.
DI Steve Arnott
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Steve is another unlikely candidate given he’s also been a dedicated advocate of cracking crime.
He’s got his fair share of problems, notably being hooked to painkillers for his bad back, which could see him ditched from the force as he's missing his medical checks.
And he’s recently slept with a former undercover officer’s wife, but he did that to dig deeper into the OCG syndicate thought to be damaging the force.
Could Steve being unveiled as H be the show's biggest bombshell ever?
Detective Chief Superintendent Patricia Carmichael
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Ruthless Patricia is loved and hated at the same time.
She means business and is desperate to shut down AC-12 and is revelling in trying to bring down long-serving AC-12 boss Ted.
Corrupt lawyer Jimmy Lakewell, who was murdered in prison, gave Steve more information about Gail Vella's murder, which Jo Davidson’s unit has been investigating.
He told him to "look deeper into the race claim" and if you add "H" and "race claim" together and mix up the letters you can get "Carmichael".
Intriguing? Definitely. But a coincidence? Maybe.
And because H is likely to be a very senior member of the police, her high-ranking position makes her a strong candidate.
Acting Detective Superintendent Joanne Davidson
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She’s already stressed she’s been forced to work for the OCG, despite trying to get out of the network.
In the last episode it was revealed she is related to the late crime boss Tommy Hunter – and he was unveiled to be both her uncle and brother in a dark twist.
She’s used various burner phones, misled enquiries and had direct contact with someone who we are led to believe is H.
But could Jo be H herself? She’s now in jail and set to be moved in the final episode of the show, giving the OCG chance to bump her off? We’ll all have to wait and see.
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PCC Rohan Sindwhani
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Not played a major role in the new series, but something just doesn’t quite sit right with his changing behaviour.
At first he was out to get Ted, but now he’s championed him to catch H in a bizarre twist.
He also famously lied to the press that there was no institutional links between officers and organised crime.
But he did speak to the murdered journalist Gail Vella after she questioned why police officers linked to child sex abuse claims were not brought to justice.
Shortly after their conversation, Gail was brutally murdered as she made it clear she was about to expose a criminal ring that linked cops to politicians and the media.
In another huge clue, he was named as the person who brought Gill Biggeloe, who was identified as one of the four Hs, into her senior role.
DCC Andrea Wise
Line of Duty fans 'work out' Carmichael is final 'H' after spotting huge pen tap clue
At the top of the chain, Andrea told Ted he would have to retire, clearly wanting to stop him in his mission to unveil.
She might be trying to frame Ted and cutting AC-12 staffing by 90 per cent, but that doesn’t mean she’s the mastermind behind the corrupt OCG network who have infiltrated the force.
Whilst viewers haven't seen much of the senior officer, she has been consistently seen over the years, making her the perfect candidate for a surprise H.
DCI Marcus Thurwell
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Theories are already circulating that Thurwell is not dead, as suspected in the last episode when Spanish police raided his villa in the dead of night.
He retired in 2005 but AC-12 investigated him during their inquiry into abusive children's home Sands Viewers in 2015, leafing to him being pursued as a suspect and sought for questioning.
Thurwell’s body – along with his wife – was meant to have been discovered in the sixth episode. However, the images from the Guardia Civil were far from conclusive.
The former Detective Chief Inspector in Central Police and had links with the OCG.
Jo was shaken after seeing photos of Thurwell, hinting he could in fact be H.
And would writer Jed Mercurio kill-off a respected actor like James Nesbitt without even using him the show?
DC Chloe Bishop
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Kate’s replacement at AC-12, Chloe has been rumoured to be the daughter of bent copper Tony Gates.
Tony was the first corrupt officer AC-12 investigated until he threw himself in front of a truck at the end of series and met his end.
She has the same name as one of his daughter’s is believed to be about the right age.
Chloe was also seen looking furtively at Patricia Carmichael, hinting that they could be secretly colluding over keeping AC-12's questions to a minimum.
But is this another red herring in the saga?
Line of Duty's Marcus Thurwell and Steph Corbett's secret link 'exposed'
John Corbett’s widow, has a secret H tile in her kitchen which whipped fans into a frenzy about all sorts of theories.
She also took a £50,000 cash bung from Ted at the end of the last series and tipped off Steve’s boss about his addiction to painkillers.
Whilst she might not be H, she is certainly hiding a few secrets from viewers which are sure to be revealed this weekend.
Line of Duty concludes on Sunday at 9pm on BBC.
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