We Have Put Her Living in the Tomb - S2-E2
Revealing mistake: When Victor and Margaret arrive back from her goddaughter's, they find their new wallpaper has been stripped. Margaret then goes up the stairs to bed and through the arch window you can see her stop at the top of the stairs waiting for the scene to end.
Chosen answer: The episode is 'The Pit and the Pendulum' The first episode of series 4.
James Ransford ★