Line of Duty concluded on Sunday night and revealed the answer behind one of the nation's biggest mysteries.
We can now put all our fan theories, assumptions and clues in the bin because Jed Mercurio played an absolute blinder by making Ian Buckells (Nigel Boyle) H all along.
Let's be honest - none of us saw that coming!
However, despite the case against Buckells looking pretty water-tight (he did repeatedly misspell 'definately' remember?) some fans believe there's still way more to this story than we think.
And now, after reading this fan theory, we're pretty convinced too.
A Line of Duty fan with the username TheHeart_TheLungs posted their thoughts on Reddit - and they concerned the psychologist who appeared twice in the series finale.
"Here's a theory that could come into play in series 7. The police psychologist that Steve was sent to by Hastings, and we subsequently saw Kate talking to, refers vulnerable officers to the OCG for blackmail," they write. "I imagine that Ted himself saw him after his divorce and money problems which led to him being blackmailed by the OCG.
"Maybe Ted has worked out the link, which is why both Steve and Kate have been sent there, so they can work it out too?"
The fan adds that this is likely because Ted himself is possibly facing criminal charges and his own corruption case, after admitting to Carmichael he played a part in John Corbett's death.
Line of Duty viewers will remember Ted was the one who told Lee Banks there was a "rat" in the OCG - which led to his brutal murder.
However, the fan detective has another theory.
"It might even turn out that Banks wasn't the one who told the OCG about Corbett, but the police psychologist?" they suggested. "Just imagine the amount of information that the psychologist must get and how useful that must be to the OCG."
They then list the officers that were blackmailed by the OCG - who could have seen a counsellor for their personal issues: "DCI Tony Gates, PC Hari Bains, PS Jane Cafferty, DCS Lester Hargreaves, DCI Jo Davidson and PC Maneet Bindra."
Hmmm, it's not impossible?
This isn't the only Line of Duty theory doing the rounds after the final, with other fans convinced that Chief Constable Osborne was truly behind everything that happened.
While writer Jed Mercurio and the rest of the Line of Duty cast have been tight-lipped about the future of the series, BBC Chief Content Officer, Charlotte Moore, has given an update about Line of Duty's future.
"Addictive event television, Line of Duty has kept the nation guessing for the last seven weeks, so it's no surprise that last night's jaw-dropping finale set a ratings record," she said in a statement.
"Jed Mercurio is a master of his craft, and I would like to congratulate him and the entire cast and crew for delivering such an incredible drama series.
"I'm looking forward to having a conversation with the team about where we go next, and what the future of the series might be."
For now, Line of Duty is available to watch on BBC iPlayer.
Featured Image Credit: BBC
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