Line of Duty has dropped an explosive trailer for its much-anticipated season six finale – and it looks like we might finally get an answer to the question, 'Who is H'?
The action-packed teaser promises that "Every investigation has led to this" before cutting to an ominous shot of AC-12's investigation board – with a spot yet to be filled by 'H', a.k.a. the Fourth Man.
We also get brief glimpses of some of the police officers suspected to be the figurehead of institutionalised corruption – Patricia Carmichael (Anna Maxwell-Martin), Chief Constable Philip Osborne (Owen Teale) and the apparently deceased Marcus Thurwell (James Nesbitt).
Another hint comes with a shot of a police document featuring a misspelling of the word "definite" – similar to how 'H' previously misspelt "definately" in communications with his cronies.
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The possible unmasking of 'H' isn't all we've got to look forward to either, as we also get a glimpse of an armed police operation, with Steve Arnott (Martin Compston), Kate Fleming (Vicky McClure) and Chloe Bishop (Shalom Brune-Franklin) all in the fray.