Cheat viewers think they've worked out the reason why university student Rose Vaughan is stalking and intimidating her university lecturer over a failed dissertation grade.
Last night's instalment saw Rose up the ante with her twisted manipulation of Dr Leah Dale by setting her eyes on the tutor's husband, Adam, and managing to get a d*ck pic out of him.
Prior to this, she'd also managed to steal Leah's engraved engagement ring, and unnervingly show up at the same events as her, all while Adam continued to defend her.
Chillingly, Rose also opened a locked box hidden in her bedroom which contained a personal photo of Leah with her own dad, originally framed on a wall in the uni teacher's family home.
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All this has led some viewers to believe that there's a deeper connection between Rose and Leah. In fact, scores of Twitter users believe that they are actually half sisters.
Fans think that Rose could be the result of an affair between Rose's late mum and Leah's dad.
It was revealed that Rose's mother committed suicide, and fans think her mum's death could be connected to the affair and cause her to seek revenge on the family.
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"Leah & Rose are half sisters. Rose's mother committed suicide after being rejected by Leah's father (with whom she had an affair). Rose is now seeking revenge. Calling it now," tweeted one person.
And another echoed: "I reckon these two are half sisters."
"#Cheat theory... [Rose] Is Leah's half sister... Leah's dad had a fling. #StalkerSibling," added somebody else on Twitter.
Some even thought that Rose could potentially be Leah's own daughter who she put up for adoption, although there's little evidence to suggest this.
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Hopefully tonight's episode will answer all our questions!
Featured Image Credit: ITV/CheatTopics: TV Entertainment, ITV
