Parts: 1 (45-minute)
Writer: Steven Moffat
Airdate: 18 May 2013
Production Code: n/a

Doctor: eleventh
Companions: Clara

Creature Feature: the Great Intelligence
Special Guests: the Paternoster Gang

Story: In 1893, Madame Vastra and her friends initiate a virtual conference call across time and space, intent on speaking with Clara and River Song. Vastra informs them that she has just learned, from a condemned serial killer with nothing to lose, that one of the Doctor's deepest secrets is about to be revealed... but what the secret is, and who has uncovered it, is a mystery to them all. The call is interrupted when Jenny, sensing a presence in their home back in the real world, announces to the group that she has just been murdered... and their virtual realm is invaded by the sinister Whispermen.

Having escaped the conference call realm, Clara soon passes this information along to the Doctor, who soon realizes exactly what the cryptic message means. In order to keep his secret safe, and stand any chance of helping Jenny, he will have to take Clara to a place and time where he had never before dared to venture...