Melanie threatens Gwen in Thursday's Fair City on RTÉ One and the RTÉ Player.
She is seething after Fergal and Gwen played a prank on her.
Having obtained Melanie's log-in details with Gwen's help, Fergal posted a silly filtered photo of Melanie on her social media accounts and added a redirect link to it on the law firm's website.
Now, Melanie is on the warpath and wants to bring her solicitor boss, Joan - Gwen's landlord - into the mix.
"Come clean now, or I'll tell Joan everything," Melanie warns Gwen.
"She'll throw me out of the house!" Gwen replies.
"That's the least of your worries," says Melanie. "She could have you done for fraud."
Fans can find out what happens next on Thursday on RTÉ One and the RTÉ Player at 8:00pm.
Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays, and Fridays.
