Esther's in shock following Lady Dedlock's confession that she's her mother. But she keeps her word and refuses to tell Ada her secret.

Cast: Gillian Anderson, Emma Williams, Anna Maxwell Martin, Carey Mulligan, Warren Clarke, Denis Lawson, Patrick Monckton, Patrick Kennedy, Nathaniel Parker, Phil Davis, Louise Brealey, Pauline Collins, Katie Angelou, Dermot Crowley, Burn Gorman