Sienna Blake finally slips up next month as her brother Dodger Savage discovers that she isn't really pregnant.
Dodger finds out the truth when he pays a visit to their late mother Anna's old house and finds Sienna (Anna Passey) relaxing there with her fake baby bump lying next to her.
The big moment takes place after a security alarm goes off at the house and Dodger heads there to investigate.
Danny Mac, who plays Dodger, told All About Soap: "Dodger feels it's such a disappointment to be let down by [Sienna]. He's gutted, disgusted and really confused. He thought he was going to be an uncle, but now he knows she's a liar like everyone else seems to be in his life!"
Dodger's immediate decision is to tell his father Patrick (Jeremy Sheffield) everything, but the strict headteacher decides to stand by unstable Sienna.
Mac continued: "[Patrick is] totally shocked and knows something needs to be done, but then he suggests they go away and pretend she's lost the baby. Dodger thinks that's ridiculous. Darren is one of his best mates and Dodger being the nicest guy on the planet - he just wants everything to be done properly and the truth to be told.
"It kills Dodger to have to lie to his friend, but Sienna's family and that comes first, so he covers for her. He sees how happy Darren is and that the baby is the driving force in his life, but Dodger feels awful that this ray of hope is going to be torn away."
With December a big month for the Sienna storyline, viewers will have to wait and see whether the Blakes' plans for a cover-up can really go ahead successfully.