This week we'll finally find out who killed Lucy Beale, after she was murdered on Good Friday last year.
In the new clip, Dot Cotton can be heard saying: "Murder, it's such an ugly word. It's so black, so frightening."
The major suspects in Lucy's murder (Max, Jane, Peter, Abi and Denise) are shown, all looking very uncomfortable.
As the residents of Albert Square gather outside the Queen Vic, an anxious-looking Peggy Mitchell makes her return.
Lauren Branning then tells Peter: "I've found something out: How she died."
EastEnders bosses recently revealed they plan to recreate the first ever scene from the show for the 30th anniversary episode.
In 1985 the soap's first episode began with Arthur Fowler, Den Watts and Ali Osman kicking down the door on Number 23 to find Reg Cox, just before he died.
Now Reg's killer Nick Cotton will be found in the house, but he'll already be dead.
Who do YOU think killed Lucy? Watch the clip and let us know via the comments box below.