The episode will last for 45 minutes as usual and will conclude at 7.30pm, followed by The National Lottery: Who Dares Wins (rather than The Voice UK, which has followed Doctor Who for the first three episodes).
The episode, the second to be penned by Luther creator Neil Cross, will air on the same day on BBC America at 8/7C.
You can read the synopsis below:
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?[Source: BBC Media Centre & Blogtor Who]