Tracy Metcalfe used some super sleuthing techniques to work out her soon-to-be step mum, Megan Macey, cheated on her with Graham Foster.
After Frank and Megan had a discussion, he decided to propose once again and she said yes, though she would not tell him about her affair with Graham just the night before.
So to share the happy news, Frank called on anyone he can find to head to the pub for a few drinks of celebration and to toast his fiancee.
But the evening’s frivolities were almost derailed when Graham arrived at the pub, shocked by the news he was told.
He had a quick exchange with Megan, who told him he was a "lovely guy" but it was just a one time thing.
Graham concedes on his choice and walks away, but Tracy can almost immediately smell a rat.
She goes into the bathroom to chat to Megan and notices something is up, so asks her if anything happened between the two of them.
Megan says nothing happened, but Tracy tells her she is lying.
She says: "You looked to the left, that means you’re lying.
"I read it in a psychopath book."
Fans were utterly impressed by Tracy’s Sherlock Holmes-like skills, but also questioned how it took her so long to work out her estranged husband David was seeing someone else.
Emmerdale continues tomorrow fro 7pm on ITV.
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