From the episode description:
Clara and the Doctor arrive at Caliburn House, a haunted mansion sat alone on a desolate moor. Within its walls, a ghost hunting Professor and a gifted psychic are searching for the Witch of the Well. Her apparition appears throughout the history of the building, but is she really a ghost? And what is chasing her?
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Hide premieres Saturday, April 20, 2013 on BBC America, BBC One, SPACE Channel. It’s Australian TV premiere is Sunday, April 21 on ABCTV.