EastEnders’ Nicola Mitchell is set to threaten Sharon Watts over her night with Grant Mitchell in an attempt to keep a secret of her own.

The BBC soap has shared first look images of scenes set to air on Thursday (March 6) in which Nicola confronts Sharon about her cheating with Grant.

It soon becomes clear Nicola is willing to keep Sharon’s secret so long as Sharon reciprocates and keeps one for Nicola. But what does Nicola want hiding and will Sharon agree?

“Nicola decides to play her trump card against Sharon over her night of passion with Grant,” the photo caption teased. “Will her threats be enough to stop Sharon telling Teddy that Barney is Zack’s biological son?”

Sharon and Nicola are seen looking tense and chatting in two photos, with Barney and Teddy joining them in the lounge in another photo. But what will the boys be told?

In tonight’s episode, viewers saw Sharon’s half-brother Zack learn he’s the biological dad of Barney as a result of a fling he had with Nicola 16 years ago.

Nicola admitted she always knew Zack is Barney’s real father but was desperate to keep it from her son (and Teddy), despite Zack wanting Barney to know the truth.

Nicola thought the gig was already up, believing Barney had discovered his real father’s identity when he awoke in his hospital bed. Barney had told his mum that he’d found out something to do with Zack.

Instead, he revealed Sharon had cheated on Teddy by sleeping with Grant, having overheard Sharon’s confession to Zack.

Nicola will use this information to threaten Sharon to keep news of Barney’s real dad’s identity from partner Teddy, who has always believed Barney is biologically his own. But will both women keep their word?