Line Of Duty fans will soon find out exactly who 'H' is in what promises to be a dramatic season finale.
As excitement builds fever pitch, armchair detectives have gone into overdrive trying to hunt for clues as to which cast-member could be the culprit.
On Sunday evening, millions will be glued to their TV sets, hoping to finally learn the identity of H question and have many more loose ends tied up.
The hunt for the elusive 'fourth man' - with links to both the OCG and high ranking police officers - has mystified AC-12 and eager viewers ever since a blinking Dot set the wheels in motion back in Series 3.
With everyone from Ted Hastings to Joanne Davidson a suspect, the reveal during Sunday's finale promises to be one of the most explosive moments in the show's nine year history.
In the final episode, AC-12 attempt to unmask H, the fourth individual commanding the network of corrupt officers behind the murder of Gail Vella.
However, sinister and powerful forces appear intent on orchestrating a cover-up.
What time is Line of Duty on?
Viewers can tune in to watch episode 7 - or the finale - of series 6 at 9pm on Sunday, May 2, on BBC One.
The drama will unfold over an hour with the show ending at 10pm, so make sure you cancel all plans as of tomorrow night.
Fans were left confused after it was suggested on Lorraine that the final would run for 90 minutes, but the BBC has since stepped in and said the show would last 60 minutes.
It seems that producers had originally planned for a 90-minute final episode, but extra material created during production meant this was extended to a full two hours.
This meant that the final episode could be cut into two and broadcast over two weeks.
Won't be able to catch the final episode? It will be uploaded to BBC iPlayer - just try to avoid all spoilers!
Think you know who 'H' could be? Share your theories in the comments section.
