Kat Moon (Jessie Wallace) is to sustain life-threatening injuries in a blaze that will rip through the Slater house.
Preliminary details about the fire were leaked earlier this month, with a source telling the Daily Star that viewers were in store for "a very moving and emotional storyline". The insider added:
"It's going to be heartbreaking as the scenes play out. There was lots of screaming and crying when we filmed the fire episodes. Everyone will be shocked when they discover who it is. The arsonist will have to live with the consequences of his or her actions for the rest of their life."
Now it has emerged that Kat is the Walford resident who will bear the brunt of the blaze. "This has the makings of a massive story for Kat," a source told Inside Soap. "The burns she'll suffer will be very severe. It means she'll have to be very brave as she receives treatment and then has to learn to live with the disfigurement."
EastEnders has previously charted the effect of living with burns in 2011 after Tamwar Masood (Himesh Patel) was left scarred on his back following the Christmas fire at the B&B. Of this latest storyline, which is set to air in the autumn, the source said:
"Kat is a true survivor and has got over terrible things in her life. But that's no reason to underestimate the impact of the fire. Everything will change and she'll have a hell of a fight on her hands."