Some Line of Duty viewers now believe they've cracked the case, and know the possible secret link between two characters. Amid speculation that Marcus Thurwell is still alive, after being confirmed dead recently, fans think he shares a "missing link" to Steph Corbett.
The widow of undercover officer John Corbett has remained in the series following his murder, and fans are predicting she has a huge role to play.
With AC-12 and viewers at home finally closing in on the mystery identity of 'H', many are wondering if it could be Thurwell, despite his body apparently being found at his Spanish home.
A video which aired in the latest episode featured a masked man who appeared to have similar eyebrows to Thurwell actor James Nesbitt, and it's
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