Season six of Line Of Duty has left fans with more questions than answers, with viewers flocking to Twitter to question what exactly is DCI Jo Davidson is up to, whether Kate Fleming has really left AC-12 and who is H?
Here, MailOnline examines some of the most prominent fan theories
Kate Fleming HASN’T left AC-12 and is working undercover
One of the most shocking discoveries was AC-12’s Kate is now working with a new team- with some fans suggesting she could even be the infamous H.
While chatting to her new gaffer DCI Davidson, Kate said: ‘I got fed upon nicking coppers, I’d rather go after the psycho who murdered Gail [Vella].’
But despite seeming confident in her new role, some viewers were left wondering if all was at it seems and theorised that Kate could still be undercover for AC-12.
Even after she tipped off Davidson and incurred the wrath of Ted Hastings, fans have continued to speculate that she is so deep undercover that even Hastings is having to keep her true agenda secret.
Kate Fleming HASN’T left AC-12 and is working undercover: Is it true? The jury is still out on this one
DCI Jo Davidson is being blackmailed by an Organised Crime Group
Jo has already survived a grilling from AC-12’s top team and appeared to clear her name when it was ex-girlfriend PS Farida Jatri who seemed to have taken part in corruption.
However, Jo was seen hitching a ride with known bent copper Ryan Pilkington and taken to collect a burner phone, making her look suspicious once more.
Fans, however, are convinced the DCI is being blackmailed by an OCG, following her emotional outburst when she was summoned to pick up a new burner.
DCI Jo Davidson is being blackmailed by an Organised Crime Group: Is it true? After her car park outburst it seems increasingly likely
DCI Jo Davidson’s mother is Anne-Marie McGillis
Fans speculated over who Jo’s mother could be after she was seen in a photograph in the first episode.
Many theorised her mother has something to do with season five character John Corbett’s [Stephen Graham] mother Anne-Marie McGillis, who was killed by an Irish Republican paramilitary group sometime after 1989.
DCI Jo Davidson’s mother is Anne-Marie McGillis: Is it true? There simply isn’t enough evidence yet to determine on way or the other
Gail Vella is still alive
Although season six has centered around the murder of journalist Gail Vella, one obscure theory is that she is in fact still alive.
Craig Parkinson, who played Matthew ‘Dot’ Cottan in the show, said on BBC Sounds podcast Obsessed with Line of Duty: ‘Somebody is in that flat and there’s some connection with Gail Vella, the investigative journalist.
‘You don’t cast someone like Andi Osho and then just have her as little magazine prints and stick them up on a kitchen wall.’
Sarah Millican – who also appeared on the podcast – went on to suggest Vella may have been a former lover of DCI Davidson’s.
Gail Vella is still alive: Is it true? It seems unlikely that the scale of police corruption is so huge that they could fake a murder victim
DC Chloe Bishop is Tony Gates’ daughter
Bishop is one of AC-12’s newest recruits, and as Gates and his wife Jools had two daughters, Natalie and Chloe, viewers have suggested their shared first name ‘can’t be a coincidence’.
Gates’ daughter was last seen in season one in 2012, which means she’d be roughly the same age as Bishop is now.
Fans have suggested that Bishop either took her mother’s maiden name or the name of a step-father, so that her true identity remains a secret – for now.
Gates died at the end of the first season when he walked into a busy road after getting a confession from gang leader Tommy Hunter, who had been blackmailing the police officer into covering up their criminal activity.
DC Chloe Bishop is Tony Gates’ daughter: Is it true? The dates and facts line up, but there still isn’t enough to write it off as a coincidence just yet
DCI Jo Davidson’s mystery blood relative is…?
After it was revealed that Jo’s DNA matched someone on the Police National Computer, fans theorized who that could be.
The overriding theories suggested that Davidson’s relative was either Tommy Hunter, of series one and two, Mike Dryden of series two, John Corbett of series five, or Derek Hilton, killed off in series four.
Tommy Hunter was the leader of the OCG in earlier series of the show, and a paedophile. His character is dead.
Mike Dryden, the former Deputy Chief Constable, was last seen resigning from his post for perverting the course of justice in series two. His Scottish links also suggest he could be related to Davidson.
John Corbett was an undercover cop in series five who had his throat slit, leaving behind a wife, two daughters, and a mysterious link to a woman, Anne-Marie, whom fans claim could also be Davidson’s mother.
Derek Hilton was a Chief Superintendent and later the Assistant Chief Constable of Central Police. He was also secretly affiliated with organised crime. He was shot in the mouth in a staged suicide in season four.
Other suggestions were Gill Biggeloe, Jackie Laverty, Lindsay Denton or Terry Boyle.
After it was revealed that Jo’s DNA matched someone on the Police National Computer, fans theorized who that could be. Scottish Mike Dryden was last seen resigning from his post for perverting the course of justice in series two