It would be hard to find a Line of Duty character more universally loathed than DS Patricia Carmichael, played brilliantly by actress Anna Maxwell Martin.
But last night fans were left thankful for her appearance when they spotted that she could have given away a vital clue in the complex hunt for ‘H’ or the ‘fourth man.’ During a particular tense interrogation interview scene with DI Joanne Davidson, DS Carmichael appeared to tap out ‘H’ in Morse code - something long-running Line of Duty fans will know and recognise from previous series of the hit drama.
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