Here’s how they describe it:
Clara is summoned to an impossible conference call, alerting her that the deadly Whisper Men are closing in on Vastra, Jenny and Strax. Someone is kidnapping the Doctor’s friends, leading him toward the one place in all of time and space that he should never go. It’s a deadly trap that threatens to unravel his past, present and future…
Steven Moffat wrote this one which is directed by Saul Metzstein. Take a look at some promotional photos below, which include the return of River Song as well as some old friends, including (it appears) Bessie!
