More than 12 million people tune in as the AC-12 finally found out who H.
And despite a disappointing response from viewers, many wondered if the BBC crime drama would be back for another series.
Now, thanks to a tweet – which has since been deleted – fans may well have their answer.
TV presenter Giles Coren has given a huge indication that there will indeed be a seventh series.
He tweeted: “A friend of mine was cast in Series 7 last week. There is no secret. “
But the tweet was quickly deleted with the show’s creator Jed Mercurio yet to reveal if he plans to write a new script.
The actor who turned out to be H, Nigel Boyle, was also tight-lipped on whether there would be another series.
Nigel, who plays Buckells, said, “Honestly, I don’t know” when asked if there would be more episodes and went on to defend the end of the sixth series.
He told BBC Breakfast on Monday: “The fans have been brilliant. So many people have invested so much in this series.
“I think there will always be an element of disappointment, but you can’t have all the series with a big shootout, an urgent exit required. Sometimes the more subtle message is more important. “
The drama’s gigantic viewing figures were 1.8 million higher than the show’s most-watched episode the week before.
And the huge numbers have made Martin Compston admit that the main stars and the creator of the series will now permanently ink the number on their bodies.
Martin, who plays DS Steve Arnott took to Twitter to tell himself that Jed, Vicky McClure and Adrian Dunbar made a pact to get the “AC-12million” tattoo if they hit those viewing numbers.
Vicky, who plays DS Kate Fleming, has confirmed that she will get the design, but it is currently not known whether Ted Hastings actor Adrian will be in it.