EastEnders is celebrating 25 years of being on the air with a live episode in which viewers will finally find out who killed Archie Mitchell.
The actor who plays the killer will be told of their character's guilt only 30 minutes before the show is broadcast tonight, EastEnders bosses have revealed.
Scriptwriters have penned 10 possible endings to the episode, with each of the different suspects rehearsing their scene unaware of which will make it to air.
Possible culprits include Peggy Mitchell (played by Barbara Windsor), Janine Butcher (Charlie Brooks), Ian Beale (Adam Woodyatt) and Bradley Branning (Charlie Clements).
But the entire cast is still clueless about the identity of the guilty party - and EastEnders bosses stress it could be anyone.
Archie (Larry Lamb) was bludgeoned with a bust of Queen Victoria in the pub named after her following storylines which saw him alienate many of the residents of Albert Square.
EastEnders fans are desperate to know who the killer is, and Sky Bet is attracting unprecedented interest.
In its latest odds, Sean Slater (Rob Kazinsky) is favourite at 2/1, even though the character has not been seen in the show since January 2009.
Peggy is put at 8/1, Janine at 40/1 and Bradley at 14/1.
Executive producer Diederick Santer, who has been planning the episode for nine months, upped the excitement levels by revealing that so far there have been three clues as to the killer's identity.
EastEnders launched as a twice-weekly show in 1985.
The only remaining member of the original cast is Woodyatt, who was just 16 when the series began.
The show has seen the deaths of 70 characters so far, 16 of them violent. There have also been 30 births.
That was the funniest police chase scene I have ever seen! Shocking acting and it made no sense why Bradley ran even though he didnt even do it!