Line of Duty fans were left reeling during tonight's series 6 finale as the mysterious H was finally unmasked. Millions tuned in at 9pm on Sunday night as DI Ian Buckells was revealed to be the "Fourth Man", bringing an end to AC-12's hunt for bent coppers.
The mystery of "H", also known as the "Fourth Man", has been the best-kept secret on the show, with fans coming up with wild theories on the shadowy leader of the OCG.
Post-credit information hinted at a seventh series as it was revealed the scale back of AC-12 continued.Line of Duty fans took to social media following the season finale, with not everyone happy as some held out hope for more to be revealed in a possible future series.
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