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The sixth instalment of the BBC corrupt coppers drama has seen AC-12 run around in circles as they try and track down the now legendary 'H' - the 'Fourth Man' thought to be the key link between the police and the OCG.
Just as we thought the team has finally nailed the perp, yet another twist rears its head - leaving Ted Hastings (Adrian Dunbar) and the team forced back to the start.
Now, time is running out for AC-12, with Ted being forced into early retirement, Steve Arnott (Martin Compston) facing his own suspension due to his injuries - and the department being merged due to budget constraints.
And while Sunday night's finale looks set to be explosive, we've been left wondering whether Jed Mercurio will be able to wrap up this compelling storyline in just one hour.
Speaking on the Shrine of Duty podcast, the unofficial podcast for the show which discusses fan reaction, theories and spoilers, the actor explained: "There are a lot of payoffs coming this Sunday.
"There are a lot of big answers coming, and I think it's deserved. You know, people have stuck with us for such a long time. I think there comes a point where the natural story arc that's been running all these years is coming to an end."
But the cheeky scamp refused to confirm whether we will find out H's true identity - so we may still be left in the dark after nearly 10 years.
Martin also discussed the possibility of a seventh series of the hit show. The most recent Line of Duty saw over 11 million viewers, with its sheer popularity making a seventh series seem surely inevitable.
"Jed [Mercurio] always takes time after a series, like a couple of months," he said.
"He likes to take the emotion out of it and sit down and looks at all that."
"There are different elements this year. Usually, we're just looking at - do people want us back, because you don't want to overdo it. But there's also - when you get 10 years in, you start to think of legacy, and if it goes down that well in some ways it might be the perfect ending."
Martin continued: "We won't do [another series] just for the sake of doing it. That won't happen. Jed will only do it if he feels there's a story there to be told."
Whether this really is the end for AC-12, we can't say for sure. But regardless how Sunday's episode pans out, we can all agree Line of Duty is one of Britain's very best dramas.
Line of Duty concludes Sunday at 9pm on BBC One.
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