Walford resident Jane Beale will be left fighting for her life when she is shot by a mysterious face from husband Ian's past.
The Eastenders plot will also involve Ian and his daughter Lucy being sent e-mails signed by Cindy Beale - Ian's ex-wife and Lucy's mother who is believed to be dead.
A source told Digital Spy, "The storyline will be massive. We can't wait for everything to come out. Cast and crew alike have been sworn to secrecy as to who's sending the messages - and ultimately who pulls the trigger."
"Cindy apparently died in prison during child birth. She can't really still be alive - can she?"
"She's got form and a motive – but there are definitely a few other people who hate Ian, too..."