While every season of Line of Duty is different, they are all somewhat familiar in one way - there is always a main corrupt officer that AC-12 is investigating. Because the gang are only interested in one thing and one thing only: nicking bent coppers! But which corrupt police officer was your very favourite? Vote in our poll below...
READ: Line of Duty star Vicky McClure reveals the real reason fans have to wait for series 6
POLL: Vote for your favourite Line of Duty villain
While we have loved seeing these corrupt police officers (despite their very best intentions!) come and go over time, fans of the police procedural drama have recently accused one of the main AC-12 gang of being part of the criminal network, and we can't believe it!
READ: Line of Duty star teases return of major character from season one
While rewatching the series on BBC, one person wrote: "Even in series one, Kate is H," adding: "Hand on heart. Very Kaiser Souzai (If you’ve seen The Usual Suspects). Always positioning herself to know something, make innocent suggestions etc. Convinced!" Another person added: "Oh my goodness really?! I've watched it from the start and can't call who H is. But your thoughts have intrigued me." What do you think?