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Hands up if Line Of Duty episode three left you tearing your hair out?
The sixth season of the BBC's hugely popular police drama is now deep into AC-12's latest case, with the anti-corruption squad investigating Joanne Davidson (Kelly Macdonald).
Joanne has raised eyebrows for her unorthodox approach investigating the murder of journalist Gail Vella (Andi Osho) - and judging by episode three, she has squarely swerved all blame after framing her buffoonish boss, DI Ian Buckells.
But the investigation into Joanne is mainly a side dish for Ted Hastings (Adrian Dunbar), who is still on the search for the mysterious 'fourth man' - the 'H' figure thought to be a senior officer that is in deep cahoots with the OCG (organised crime group to me and you).
And now, Line Of Duty fans are convinced that there's a 'clue' about H's identity which has been secretly weaved into the show - in a kitchen, of all places. See for yourself here.
When Steve Arnott (Martin Compston) confronted Steph Corbett (Amy De Bhrún) about her finances in the wake of her husband John Corbett's (Stephen Graham) death, eagle-eyed viewers spotted a distinct H pattern on her kitchen tiles - and flocked to Twitter to share their findings.
"'H' finally found in John Corbett's kitchen. Look above the cup rack behind Steve, but Steve totally missed this," joked one Line of Duty fan.
"Anyone else noticed Steph Corbett's kitchen tiles pattern? .... H is everywhere," a second queried.
"It is now my new theory Steph is indeed H and is so proud of her manipulation she displays it in her kitchen," a third said, while a fourth added: "The tiles in Steph's kitchen have an H pattern repeated on them."
Let's just take a second here - it seems hugely unlikely that Steph could be H, as AC-12 have previously theorised that H is a high-ranking officer with knowledge of the inner-workings of police.
It would also mean that Steph fundamentally sanctioned the murder of her own husband - which we find unlikely, to be honest. However, with Line Of Duty being so full of twists and turns, we wouldn't put it past Jed Mercurio to throw in a total curveball.
Elsewhere, some fans are convinced Joanne Davidson is the shadowy H figure.
At the end of the episode, we saw her using the same instant messaging service as the OCG did in season five to speak to an unknown figure.
As the person was typing, the credits rolled - which suggests Joanne could be orchestrating everything, or at the very least in contact with who is.
Roll on next Sunday!
Line of Duty continues Sunday at 9pm on BBC One.