Things aren't looking good for Chas (Lucy Pargeter) as she faces trial over Carl King's death in upcoming episodes, but Debbie is determined to make things even worse by testifying as a witness for the prosecution.
Debbie is unable to forgive Chas for her affair with Cameron Murray and will do whatever it takes to ensure that the verdict is guilty, wanting Chas away from the village for good. But will Debbie get the result she's hoping for?
Here, Charley Webb - who plays Debbie - reveals more about what's ahead for her character in the next few weeks.
There's a brief moment of happiness for Debbie on the way next week as she brings Sarah home from hospital. How does it go?
"Debbie is very excited about this. It's a massive moment for the whole family, because they've all been waiting for it for so long. They have a little party for her and it's really nice.
"The worries aren't over, though - Debbie still needs to make sure that Sarah doesn't get any infections and that she stays healthy. Sarah is not back to normal and she's not going to school, but she's in a much better position than she was before."
How does Debbie explain the Cameron situation to Sarah?
"Sarah knows that Cameron and Debbie aren't together anymore, but she can't understand why she can't really see Cameron as much. She wants him to be there, as he's been a massive part of her life.
"I think that's really hard for Debbie, because deep down she wants him to be there too. She's still madly in love with Cameron, but can't have him. She finds it difficult to talk to Sarah about it, but she does in the end after psyching herself up to do it.
"The situation is still really raw for Debbie. She's very hurt and upset over Cameron's betrayal."
What are Debbie's feelings towards Chas at the moment?
"Debbie is still really bitter when it comes to Chas. She's also still in complete shock, because Chas was her best friend, they're family and they were just a massive part of each other's lives. What Chas did was the ultimate betrayal."
What can you tell us about Debbie's plan to make sure that Chas is locked up for life?
"Debbie has decided that she's going to go to court, stand on the witness box and basically tell them everything she possibly can to make Chas sound guilty!"
What is Debbie's motive for such a drastic plan? Is it just revenge?
"It's massive revenge! But I think it's also the fact that Debbie still loves Chas so much despite everything that's happened. She may not like her, but she does love her because they're family. So it's almost like Debbie can't bring herself to see Chas every day.
"The hurt is so raw and she doesn't want to be reminded of the situation any further, so Debbie thinks it'd be much better for her if Chas stayed locked away and out of her life."
Cameron tries to get Debbie on Chas's side for the trial, doesn't he?
"He does, and Debbie kind of goes along with it at first. She pretends that she's going to possibly help Chas by being a witness for her defence. But then right at the last second she says to Cameron, 'Are you joking? Do you really think I'd do anything to help you?'
"Cameron pleads with her and says, 'We really need your help', but then him saying 'we' makes things even worse because it's those two together."
How does Debbie feel when the day she has to give evidence arrives?
"Debbie's totally ready for it. She puts on this complete mask about the whole thing. She puts on a dress, she puts on red lipstick and it's so out of character for her. It's almost like she's pretending to be someone else. She's absolutely determined.
"I do think Debbie is slightly on the edge of a breakdown. She's acting so neurotically with a lot of things."
Gennie is also at the trial, but she's going in support of Chas. How does Debbie feel about that?
"She doesn't care. She absolutely does not care. Debbie isn't interested in who's going, why they're going, or what team they're on. All she cares about is ruining Chas's life."
How does it go for Debbie in the witness box?
"It goes really well, up until a certain point where it starts to go a bit differently! I won't give too much away, but Debbie thinks she's saying all the right things and it's looking like it's going her way, but then it suddenly takes a turn…"
Does Debbie have to sit and hear Cameron give his evidence supporting Chas?
"She does. You'll see that Debbie puts on a really brave face, but then she totally crumbles when she gets home. It's just destroyed her."
How would Debbie react if Chas was found not guilty?
"She'd be determined to ruin her life in some other way! She'd be determined to get revenge. But at the moment, it's not in her mind, as she is 100% positive that Chas will get sent down…"
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Emmerdale airs weeknights at 7pm on ITV1, with an extra episode at 8pm on Thursdays.