Line of Duty viewers are sure they've spotted the final H after noticing DCS Patricia Carmichael tapping her pen in a suspicious manner whilst interviewing Jo Davidson.
She and Kate Fleming had been taken into custody after fleeing the scene following the shooting of bent PC Ryan Pilkington, and Jo promised to cover for Kate.
Several clues have been dropped that Carmichael, played by Anna Maxwell Martin, is the final major corrupt officer, aka H, throughout the series.
During the fifth episode, ill-fated Jimmy Lakewell told Steve Arnott to "look beyond the race claim" if he wanted to find the mysterious H.
Eagled-eyed fans spotted that if you take the letters "race claim" out of Carmichael, you are only left with one letter – H.
In Sunday's episode, fans were further convinced that Carmichael is hiding a huge secret after realising she was tapping out H in Morse code during the show's longest ever interview scene, which was a whopping 29 minutes.
Viewers rushed to social media to point out the huge clue after realising Carmichael making four taps of her pen on the table on a number of different occasions.
One posted: "Don't mean to alarm anyone but at Carmichael's pen? Tapped four times and H in Morse code is . . . ."
Another added: "PATTY C JUST TAPPED 4 TIMES MORSE CODE FOR H??"
Fans couldn't help noticing how eager the DS was to steer the interrogation away from police corruption and who H is during the tense interview scene.
Sensing that Davidson knew crucial pieces of information about "the fourth man" and the network of corrupt police officers, Ted Hastings pushed hard to find out more.
But he was quickly shut down by an on-edge Carmichael, who said: "The interviewee has repeatedly said she doesn't know about any of this.
"It's a dead end. So let's focus on events surrounding the events of the killing of Ryan Pilkington."
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The hated TV character then turned to Martin Compston's character and said: "DS Arnott. Let's chivvy things along shall we?"
AC-12 were forced to drop it as Davidson was placed in custody at the end of the episode, with her fate being revealed next episode.
The sixth series will conclude next Sunday, and there are plenty of unanswered questions about the fate of Jo, AC-12 and who the elusive H is.
Line of Duty concludes next Sunday at 9pm on BBC.
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