Whitney Dean gets the shock of her life in tonight's EastEnders when her younger step-sister, Tiffany Butcher, arrives on her doorstep - with no warning.
It soon becomes clear that Tiff is hiding something from Whit - but what?
Whitney had been preparing to move to Wakefield to start a new life and career, but with Tiffany back - and clearly keeping something to herself - Whit's plans are thrown into chaos.
Tiffany doesn't want to go home to Milton Keynes (where she moved with Bianca a few years ago) and Whit is determined to get to the bottom of why.
I can’t wait to show everyone how much Tiffany has changed.
Later this week, Whit thinks she's found the cause of Tiffany's sudden appearance when she finds a pregnancy test in the bin.
Is Tiff really pregnant? And does Bianca know where her daughter is?
As the sisters talk, it soon becomes clear that Tiff is hiding even more than Whitney originally realised.
What else is she about to discover?
It was announced that Maisie Smith would be reprising her role as Bianca's daughter last year.
Maisie said of her return to Walford: "It’s great to be back on the set of EastEnders. It’s been lovely to see some old faces and meet new ones too.
"I can’t wait to show everyone how much Tiffany has changed."