Nervous Line of Duty star Martin Compston has taken to Twitter to reveal he is pacing his room ahead of Sunday's Line of Duty series finale.
The actor, who plays DS Steve Arnott, appeared to confirm this is the end for the much-loved police drama, with no official word as to whether there will be a series seven.
But Martin said he hoped fans of the show feel the ending is fitting and satisfactory, with many desperate to see H unmasked.
He wrote: "Done about 40 laps of this flat in the last hour. Excitement, anxiety and terror are a lethal combination. Phone going off for the evening, hopefully we deliver an ending you all deserve".
Alongside the tweet, he posted a gif of his character Steve raising a glass of wine and looking stressed out.
One fan replied: "you’re literally summing up how we all feel & you know the outcome!!"
Another, referring to Martin's natural native Scottish accent compared to Steve's Southern English, wrote: "You’ve been great. That accent had me fooled."
Paddy McGuinness replied: "The success is well deserved pal."
Another follower penned: "Bless your poor wee waistcoated heart! Thank you for giving us 6 incredible series of #LineOfDuty it's really helped to keep me sane over the last 7 weeks and you will all be missed".
Martin's co star Adrian Dunbar, who plays Superintendent Ted Hastings, posted a sweet behind-the-scenes snap of him with Martin and Vicky McClure, who plays DI Kate Fleming.
Alongside it, he wrote: "Today’s the day fellas. #LineOfDuty... #TedHastings ".
Fans have been left worried the sixth series will end up being the last one, as there is no indication yet that creator Jed Mercurio is making another series - while others are more nervous about who H will be.
One of Adrian's followers replied: "Don't go guys !! hope this isn't the last ever !we won't have anything to get out of bed for if you do".
"If Ted end up being H we will revolt," joked another.
"Oh I can’t cope! Mother of God," quipped a third.
* Line of Duty is available to watch on BBC iPlayer
