As we get ready for episode four of Jed Mercurio's latest masterpiece, the BBC has confirmed that series five will conclude with a "nail-biting 90-minute finale".
Little to nothing has been given away in terms of plot, but Line of Duty has promised that "closely guarded secrets" will be revealed. Could the true identity of 'H' finally come out?
Line of Duty's current record-breaking run has been a hit with fans thanks to its usual twists and turns – and how easily it lends itself to a game of bingo. Drink for every time you hear "bent coppers", and so on.
One of the main, and most pressing, mysteries of season five is the potential corruption of AC-12's gaffer, Superintendent Ted Hastings (Adrian Dunbar), who has been acting especially suspicious as Operation Peartree unravels.
Early scenes in last week's episode saw Ted close his laptop just moments after UCO John Corbett (Stephen Graham) and Lisa McQueen (Rochenda Sandall) finished messaging 'H' via covert software.
Fears for Ted's integrity grew further when the fan-favourite later sent his laptop to be destroyed. Mother of god, indeed.
Line of Duty continues Sunday (April 21) at 9pm on BBC One.
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