Don't miss a thing by getting the latest from the Manchester Evening News sent direct to your inbox It's the BBC cop drama that has fans guessing and second guessing at every turn.
And as we reach the half way point of Line of Duty series six, fan theories and speculation about the criminal mastermind at the heart of the Jed Mercurio-penned drama continue to mount.
While this series kicked off around suspicious activity at The Hill and the behaviour of DCI Joanne Davidson, talk has quickly turned to how it all links back to "H" - the person, or indeed people, who operate on the dark side of the (police) force.
The concept of H first came to light in the dying breath - or blinks - of DS Matthew "Dot" Cottan back in series three. He was
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