Line of Duty: Steve Arnott in grave danger after star posts cryptic clue?

Show writer Jed had also teased “secret guest stars” in a previous post – who will the latest season see join the ranks of AC12?

The show has already announced a casting shake-up for the upcoming series as Kelly MacDonald was revealed to have 

She has been dubbed: “The most enigmatic adversary AC-12 have ever faced”.

Her character, Detective Chief Inspector Joanne Davidson, will also be under suspicion as last season taught fans that no one is to be trusted.

What does she want with AC12 and will there be more to her than meets the eye?

Viewers will have to wait until next year to see the drama of season six unfold as the ultimate question still remains – who is H?

Line of Duty will return to screens next year on BBC One.