The story producer of Emmerdale has promised fans that the ITV soap will be rocked "like never before" as Kim Tate (Claire King) sets out to unmask her poisoner.
The storyline sees Kim inviting "her nearest and dearest" to lunch at Home Farm. She reveals her shock retirement plans and then looks for clues.
"Kim's explosive discovery will send her on a quest for vengeance that will rock the Tate Empire like never before," teased story producer Sophie Roper.
"With a traitor in her midst, Kim's a very dangerous enemy and as the plot to unmask her poisoner thickens, Home Farm will become a hotbed for secrets and lies.
"But as Kim discovers who has committed the ultimate betrayal, will Kim be able to stop them before they stop her?"
Emmerdale airs weeknights on Virgin Media One and ITV1.