The BBC has released a brand new extended trailer for series six of Line of Duty.
After an absence of two years, the twisty drama will return for a new run on Sunday, March 21, and the latest advert suggests that AC-12 will be doing their best to finally figure out the mystery of 'H'.
In an added twist, the trailer features a blink-and-you'll-miss-it shot of a QR code which allows fans to go on an online treasure hunt to uncover more information and an exclusive clip.
Watch the ad below:
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