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DSI Marcus Thurwell (James Nesbitt) is reportedly Ladbrokes favourite to be unveiled as the antagonist with odds of just 7/4, with viewers convinced that the bent copper is still alive despite being declared dead by Spanish officers in the last episode.
Meanwhile, DCI Patricia Carmichael (Anna Maxwell Martin) has odds of being the villain of 2/1 according to Betfred.
Caught at last? By the look of determination on their faces, Kate and Steve look set to finally put an end to the mystery that has eluded them for months - but viewers will have to wait and see whether they do have H in their sights
BBC News
By Alex Taylor
image captionThe finale of Line of Duty s sixth season is likely to have big implications for the AC-12 anti-corruption unit
Jesus, Mary, Joseph and the wee donkey - the latest series of Line of Duty reaches its dramatic conclusion later.
The penultimate episode of series six of Jed Mercurio s long-running police corruption drama was the show s most-watched to date.
Eleven million UK viewers tuned in last Sunday to learn secrets about Acting Detective Superintendent Joanne Davidson s family background - that s more than the 9.85 million who watched The Oscars in the US on the same night.
Every BBC One s Line of Duty theory ahead of nail-biting finale
WARNING POTENTIAL LINE OF DUTY SPOILERS BELOW
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As the hugely popular Line of Duty series six draws to an end - desperate fans have been frantically trying to work out what s in store.
Millions of viewers are hoping that H will finally be unmasked when the show airs on Sunday, May 2, spanning nine years.
Line of Duty s H s identity confirmed in jaw-dropping Fourth Man twist on show
Line of Duty fans prayers were answered during Sunday evening s series finale - the identity of the mysterious H was finally confirmed, following years of speculation. Ian Buckells was unmasked as The Fourth Man in spectacular scenes
21:41, 2 MAY 2021
Updated
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