Another EastEnders mystery deepens when Jean (Gillian Wright) returns to Walford in the coming week and gets herself all worked up over that key Stacey wears around her neck.

It was supposed to be a happy return for Jean, who’s back to tell Stacey (Lacey Turner) she’s marrying Ollie Walters (Tony O’Callaghan).

But then she sees the key – rather prominently displayed on Stacey’s chest – and things turn dark…

We know Stacey’s brother Sean gave her the key, but she’s said she hasn’t got a clue what it opens.

Does Jean know? From her reaction, she clearly knows something about it, but what?

If it was anything good, we don’t think Jean would want to rip it off Stacey’s neck.

So, Jean thinks the key is bad news. But why?

Jean’s freaking out freaks out Stacey, who’s even more determined to hang on to the key – and find out what it unlocks.

“We keep going on about the key but we will find out a lot more about it,” promises Enders boss Dominic Treadwell-Collins.

Hopefully sooner rather than later…

EastEnders continues on BBC1, Monday, June 29, 8.00pm