The finale to season 5 of Line of Duty left us with as many questions as it did answers. Who is H? Who was the OCG actually talking to on that laptop? Will anyone ever be questioned by an officer one rank senior? We're desperate for answers and while we're waiting for series 6 to provide them, we're thankful that dutiful fans have gone out of their way to give us something to hold onto.
Here are the best fan theories about Line of Duty series 6.
Kate Fleming is H
Reddit is absolutely teeming with 'Kate-is-H' theories along with just as many responses from people who can't bear the thought. The basis of the theory comes mostly from the idea that Kate is so squeaky clean it's too good to be true. Both Ted Hastings and Steve Arnott had some bad behaviour in their histories: from Steve's actions with Lindsay Denton in season's 2 and 3 to Hastings' questionable financial conduct, but Kate appears to have an unusually spotless record, leading some viewers to think she could be H, or at least involved with the OCG (Organised Crime Group).
One Reddit user claimed that show creators have been hinting at this with all the references to nights when she was late home, suggesting she was out doing criminal dealings. While another suggested that Hastings has already worked out that Kate is corrupt and is simply waiting for the perfect moment to out here.
Dot is still alive
Some believe that one of the twists of series 6 will be a past character being revealed to still be alive, and that if anyone is coming back from the dead, it'll be DI Matthew 'Dot' Cottan. Not only was he a hugely popular character with fans, but the identification of H seems to hinge almost entirely on his dying declaration from series three, plus we never actually had Dot's death confirmed and in Jed Mercurio's world we need that kind of proof.
Many fans weren't keen on the Morse code theory which AC-12 devised from the video of Dot's dying declaration. Instead lots of them believe that Mercurio is messing with viewers and Dot will return in series 6 to clarify that his declaration was misinterpreted as meaning "H" when actually he was trying to tell Kate there were four caddies.
There could be some Hollywood cameos
One eagle-eyed fan spotted that Line of Duty seems to have a habit of casting actors from Guy Ritchie films, and perhaps that might mean we could expect some big names to grace the interview room at AC-12:
"Lennie James [Tony Gates] and Stephen Graham [John Corbett] were both in Snatch. Thandie Newton [Roz Huntly] was in RocknRolla. Clearly they're going for actors from Guy Ritchie films, so it will either be Robert Downey Jr, Henry Cavill or Matthew McConaughey."
Sure, it's a long shot, but we're very on board with DI McConaughey demanding to be questioned by an officer one rank senior in that Texan drawl.
Gill Biggeloe is H
For a lot of us, finding out who H is has quickly become our life's work, and we are completely indebted to the people of Reddit for coming up with this very plausible theory that it's the one and only Gill Biggeloe.
The theory rests on the following six points:
H is likely to be a character we have already met and know well in order for it to have impact.
If you look at her actions from the basis that she is H, everything she did makes sense. Everything she did served the OCG in some way. Additionally, she has access to the department's most sensitive information but isn't a police officer, leaving her in AC-12's blind spot.
There has been an undercurrent of sexism running through the series, and it's something Gill herself brought up in series 5. It would be the perfect middle finger to all of it if a woman turned out to be the head of the OCG.
The OCG has used DNA in the past to blackmail police officers, so it's pretty convenient that Gill happens to have slept with Hastings.
During his dying declaration Dot was actually trying to communicate the letter 'G', which comes right before 'H' in the alphabet. Which we could assume to be 'G' for Gill.
Ryan is going to be a big part of the new series
You may not instantly recognise his name, but Ryan has been an important character in Line of Duty since series 1, when he first appeared as the outspoken kid working for the OCG on the Borogrove Estate. He worked for Tommy Hunter delivering burner phones to people his boss was blackmailing.
In series 5 he's reintroduced into the show, still a member of the OCG and eventually is the one to kill John Corbett (Stephen Graham) after they discover he's a undercover officer. At the end of series 5 we discover that he has been accepted into the force as a Student Police Officer. Of course, he's still a very active member of the OCG and now that he's working his way into the police force he's only going to become more instrumental.
Some fans suggest he may be being groomed to work his way into AC-12 just like Dot was, but since Kate knows Ryan is part of the OCG that seems unlikely. Another Reddit user instead suggests a far more plausible looking theory, "...I don't think he will join ac/12... my guess is that as a police officer his task will be to guard important witnesses."
All we know definitively is that Line of Duty series 6 cannot come soon enough.
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