But what could it be?
Rhona kicks herself when she realises that she unwittingly convinced her mother to stay longer in the village. And after a conversation with Mary, Marlon is determined to propose to Rhona soon.
As they prepare for Marlon’s surprise party at Smithy, Rhona and Mary experience a rare moment of tenderness as they bond over their shared secret.
Emmerdale continues Mondays to Fridays at 7.30pm on ITV